Cardy Nitrate NO3 - Spectrum Technologies
Contents
1. Displayed by one of three automatically that the solution bridges across the switched ranges sensor pad properly X1 0 99 ppm X10 100 990 ppm X 100 1000 9900 ppm 10 Pipette Use for depositing solutions on the sensor for measurement 11 Standard Solutions Use for calibrating 5 Sensor pad lon specific electrode the meter principle replaceable 12 Yellow Seal Use to cover the sensor 6 Sensor cover protects the sensor during reference junction when meter is idle for storage more than 30 days The reference junction is positioned on the right side of the sensor pad SOIL TEST KIT ACCESSORIES 2329S 2329 Description Starter Kit Replenishment Kit Std Solution 450ppm NO3 N 30ml 1 1 Extractant 20ppm NO3 N 1 Liter 1 2 Cups 807 3 3 Measuring Spoon 29 5 cc 1 1 Pipet 1 1 Filter Papers 15 30 Included with meter in item 2300 Handheld Plant Sap Press item 2725 Hydraulic Plant Sap Press item 2720 CARE FOR YOUR CARDY METER 1 If the sensor is new or has been inactive for over a month drip to 4 drops of either one of the standardizing solutions onto the sensor pad using a sampling sheet to warm up the sensor for 20 to 30 minutes The meter can be off This improves sensor response time and reduces the drift of the readings 2 A stable meter reading occurs when the value on the LCD display has not changed for a period of three 3 seconds 3 Wait 30 to 45 sec2. of the sample collection pro cedure and place it in the press Close the press and rotate so the holes face up Center a sampling sheet over the holes As the press is squeezed the sap will satu rate the sampling sheet Make certain to press all the sap from the plant tissue in the press Note the plant sap press may be ordered from Spectrum Technologies Inc or your distributor 2 With the tweezers transfer the satu rated sampling sheet directly onto the sen sor pad 3 Wait for the reading to stabilize 30 to 45 seconds Note that the reading may be in units of NOs or depending on how the meter was calibrated 4 Rinse the sensor pad with the distilled water and blot dry Repeat the rinse 2 to 3 times 5 Repeat the procedure from the bulk sample 2 3 times Average the result to get a representative result for the sample being measured Important Do not make measurements with the meter sensor in direct sunlight MEASUREMENT OF GROUNDWATER AND NUTRIENT SOLUTIONS Sample Measurement Using a pipet transfer several drops of liq uid onto a sampling sheet on the sensor pad Make certain that the liquid covers both dots on the sensor pad After the dis play has stabilized 30 45 sec read the results from the meter display For ground water the acceptable nitrate levels are 45 ppm as nitrate or 10 ppm as nitrate nitrogen Nutrient Solutions Perform the measu
3. pipette to transfer the soil extract onto the sensor of the Cardy Meter 6 Read the value from the digital display af ter it has stabilized 30 45 sec Subtract 20 from the display value This accounts for the 20 ppm NO in the extractant solution For Ibs acre multiply by 4 for a sampling depth of 12 inches 7 Rinse sensor and blot dry Display should read close to 0 with distilled water on it if not rinse again Moisture content Sand Clay sand Sandy clay Clay Loess Very dry 8 15 17 23 12 20 24 33 Med moist 41296 425 3190 43 moist 14 30 38 53 Very moist 16 35 45 63 Table 1 Estimated soil nitrate percentage correction for soils at various field moisture levels Increase the value given by Cardy meter by the percentage shown in the ta ble MEASUREMENT OF SOIL LESS MEDIA Sample collection Collect just before plants are irrigated 2 Avoid the top layer of media with no roots Collect root media from the bottom 7 of the pot 4 Take samples from 10 or more plants dis tributed in the sample population 5 When a sufficient amount of root media is collected mix the sample Sample Preparation and Analysis 1 2 Extraction method Measure a known volume of root media in a beaker or cup usually 50 to 100 ml or 1 4 to 1 2 cup Fill firmly so it is compressed as it was in the pot Be consistent when measuring DO NOT lightly fill or heav
4. 0 1300 1600 Mid tuber growth bulking 11 000 15 000 900 1600 Late tuber growth maturation 6 000 8 000 550 700 13 Petiole NO3 N Sufficiency Levels Source Michigan State University The following guidelines are based on one year s research results and will be revised as necessary based on future research findings Readings taken on youngest fully extended petiole Carrots Adequate petiole sap nitrate concentration Carrot shoulder diameter in Nitrate N ppm Nitrate ppm Prior to sizing 750 3 300 0 00 0 25 550 2 420 0 25 0 50 450 1 980 0 50 0 75 300 1 320 0 75 1 50 250 1 100 gt 1 50 200 880 Celery Adequate petiole sap nitrate concentration Weeks after transplant Nitrate N ppm Nitrate ppm 0 5 800 3 520 5 6 725 3 190 6 7 650 2 860 7 8 575 2 530 8 9 500 2 200 9 10 425 1 870 10 11 350 1 540 11 275 1 210 Onions Adequate petiole sap nitrate concentration Growth Stage Nitrate N ppm Nitrate ppm Up to 5 leaves 800 2 520 5 to leaves 600 2 640 Bulb initiation 300 1 320 Bulb bulking 250 1 110 14 Pre Sidedress Nitrate PSNT Soil Test Interpretation University of Tennessee 17 ppm NO N Low 17 25 ppm NO N Low 225 ppm NO N Low Rutgers Cooperative Extension PSNT Soil Test Level Sidedress N ppm NO N Recommendation 1 15 160 16 20 120 21 25 80 26 30 40 31 0 University of Wisconsin Soil Potential Very High High Medium Low PSNT resul
5. 800 1000 500 800 300 500 900 1000 800 900 1000 1200 800 1000 700 800 1000 1200 600 800 400 600 400 600 300 400 200 400 1400 1600 1400 1600 1200 1400 800 1000 500 800 1200 1600 1000 1200 800 1000 1200 1400 1000 1400 1000 1200 900 1200 NO N ppm Fresh Sap 800 900 600 800 600 800 300 500 200 500 200 500 1200 1500 1000 1200 800 1000 600 800 Optimum range of nitrate nitrogen concentrations dry weight and sap Petiole NOs N Sufficiency Levels For Potatoes Source Univ Wiisconsin Madison Growth Stage Norkotah Shepody Onaway days after Norland R Burbank Superior emergence Atlantic Snowden Kennebec dae Dry Weight Basis 30 2 5 2 8 2 0 2 3 2 3 2 5 40 2 3 2 5 1 7 2 2 2 0 2 3 50 1 8 2 3 1 2 1 6 1 5 1 9 60 13 1 9 0 8 1 1 0 9 1 2 70 0 8 1 1 0 5 0 8 0 4 0 6 Sap Basis ppm NO N 30 1900 2100 1600 1800 1800 1900 40 1800 2000 1600 1700 1600 1800 50 1400 1800 1000 1300 1200 1500 60 1110 1500 700 900 500 1000 70 700 900 500 700 400 600 Values from the Cardy can be converted to dry tissue calibration by using the equation Dry Weight NO3 N 0 00142 ppm sap NO3 N 0 21 Petiole NO3 N Sufficiency Levels Russet Burbank Pota toes Source Univ of Minnesota Petiole ppm Growth Stage Dry Tissue Fresh Sap Early Vegetative tuberization 17 000 22 00
6. Nn A ot wn gt c Z gt zZ CARDY NITRATE METER Catalog 2300 Spectrum Technologies Inc CONTENTS Introduction Specifications Meter Components and Accessories Meter Functions Soil Test Kit Accessories Care for Your Cardy Meter Calibrating Solutions Calibration Measurement Procedure Measurement of Soil Nitrate Measurement of Soil less Media Measurement of Tissue Sap 9 Measurement of Groundwater and Nutrient Solutions Sufficiency Levels Service and Support Maintenance Warranty This manual will familiarize you with the features and operation of your Cardy Nitrate Meter Please read this manual thoroughly before using your meter For customer support or to place an order call Spectrum Technologies Inc at 815 436 4440 between 7 30 am and 5 30 PM CST FAX 815 436 4460 E Mail specmeters aol com Website www specmeters com Spectrum Technologies Inc 23839 W Andrew Rd INTRODUCTION Congratulations on the purchase of your Cardy Nitrate meter This manual describes how to use your Cardy meter and how to keep it working accurately for many years Read it thoroughly in order to make effective use of your meter Nitrogen is one of the most important ele ments required for plant growth It is a key component in chlorophyll the pigment in plants that harnesses the sun s energy to convert CO into carbohydrates and makes plants green Tools tha
7. ct shall be repaired or replaced free of charge should any trouble occur during the course of normal use if returned within the warranty period three months from date of purchase In which event contact the dealer of purchase Return CARDY with proof of date of purchase 2 Expenses shall be incurred in the following instances within the warranty period Costs such as postage shall be borne by the customer a When the date of purchase and store name is not written on the warranty b When trouble or damage has been incurred due to misuse abuse and or improper handling c When the CARDY has been repaired modified and dismantled by persons other than a HORIBA designated agent or service shop d In the event of changes in external appearance such as scratches or dirt caused during use or battery fluid leakage e In the event of unsuitable movement dropping or accidents such as fire earthquake floods or burglary f When replacing consumables and accessories 9 When cause of trouble lies not in the CARDY itself h When this warranty is not shown and when necessary particulars have not been written in the warranty Our obligation under this warranty is to repair or replace the CARDY free of charge in accordance with the conditions laid down herein Accordingly this warranty does not limit your specific legal rights The warranty card must be completed and mailed promptly in order to register your CARDY
8. ctor immediately Sensor The field replaceable sensor has a life of approximately 150 300 measurements depending on the sensor age frequency of use and maintenance The sensor is worn out when a the sensor will not calibrate to the slope standard there is no more 16 adjustment in the slope screw or b the meter drifts from its calibration standards when rechecking the two 2 point calibration Repeat the calibration and check for drift Samples likely to damage the sensor pad include organic solvents surface activators cement alcohol strong acid strong alkali etc The sensor pad is a thin soft film Do not handle in such a way that will scratch or damage the sensor If samples have a small amount of oil it may be necessary to clean the sensor with a mild detergent solution To replace the sensor turn the meter over and take the sensor off both hooks with the tweezers or a similar tool Attach the new sensor to the meter properly until it makes a clear click sound WARRANTY This product has been brought to you having passed severe quality control and inspections Should any trouble occur during the course of normal use the CARDY shall be repaired or replaced free of charge in accordance with the stipulations laid down herein The term of this warranty shall be for three months from date of purchase This warranty excludes batteries sensor and accessories Warranty Stipulations 1 The produ
9. e me ter was calibrated 3 Rinse the sensor pad with the distilled water and blot it dry with tissue or a paper towel Repeat rinse and blot dry 4 Repeat the procedure from the bulk sample 2 3 times and average the result to get a representative result Important Do not make measurements with the meter sensor in direct sunlight MEASUREMENT OF SOIL NITRATE Sample Collection Collect at least 15 to 20 core samples from an area not exceeding ten acres by using a Z pattern Areas having different soil types or management histories should be sampled separately Sample the top 12 inches of soil Some universities recommend sampling the top 24 inches in 12 inch increments Contact your county extension agent for recommen dations Care should be taken to ensure that soil samples are not biased by the presence of rows or bands of fertilizer Sample Preparation Samples should be dried within 24 hours of collection to minimize changes in NO3 N con centrations Before drying crumble the soil to avoid large clods that will be difficult to crush when dry The samples should then be dried by spreading on a thin layer of newspa per at least 3 pages thick and placing over night in a warm spot with good air move ment Soil will dry in a few hours if placed in a sunny location exposed to the wind If dried indoors 24 to 48 hours may be required In door drying time can be reduced with the use of a fan For oven drying spr
10. e nitrogen Note this is similar to reflecting length as 6 in or Ve ft Laboratory analysis and uni versity guidelines are generally expressed as NOs N nitrate nitrogen To convert NO N nitrate nitrogen to nitrate multiply or divide NO3 N 4 42 226 NO Therefore 2000 ppm nitrate nitrate nitrogen 88 ppm NO nitrate nitrate nitrogen 450 ppm N 20 ppm NO N The following table shows the concentra tions of the various calibration standards in each unit of measurement Description Type ppm ppm NO 2338 450ppmNO N STD 2000 450 2339 20ppmNO N SLOPE 88 20 2336 450ppmNO N STD 2000 450 use with plant sap water and nutri ent solutions For use with soil samples CALIBRATION Important The user must be consistent in calibrating the meter to either NO or NO N on both standards 1 Turn the power ON 2 Open the sensor cover rinse the sensor pad with distilled water and blot the sensor pad clean with a piece of sampling sheet or tissue Repeat rinsing and blot dry 3 Place a piece of sampling sheet onto the sensor pad and drip 3 to 5 drops of the standard STD solution on it or drip the solution directly onto the sensor pad Be sure both dots A amp B as shown on pg 7 on the sensor pad are covered and there is a continuous bridge between them 4 After the readout has stabilized 30 45 sec adjust the STD dial unt
11. ead a thin layer of soil on a cookie sheet or pie plate Place it in an oven set to no more than 250 F with the door slightly ajar Consider the soil dry when it crumbles rather than compacts under pres sure After drying crush the soil by using a block of wood or other suitable device Crush until the soil particles are the size of BB s or smaller Sift with a flour sifter or other 10 mesh screen Mix soil thoroughly Soil testing of mineral soil requires the Soil Test Kit A starter kit is included with the Cardy NO meter 2300 Additional Soil Test Kits can be ordered as item 2329 Important Be sure you are using the soil standard solutions item nos 2335L and 2336 when calibrating the meter for soil tests Do not use the calibration standards for water plant sap See Calibration pg 6 Measurement Procedure 1 Measure 2 level measuring spoons 30 ml full of dry soil into the soil sample cup 2 Add 2 30 ml measuring spoons of the Soil extractant to the soil 3 Mix the soil and the solution by stirring with the spoon for at least 2 minutes making sure the soil sample is thoroughly mixed with the distilled water Let stand for 5 minutes 4 Fold a circular filter in half twice and open it up to form a cone Place it in the soil suspension as far as possible The filtration will take place from the outside of the filter to the inside 5 As soon as sufficient filtrate accumulates in the filter use the small
12. il the display reads the value on the bottle i e 45 x 10 Be mindful of the whether you are Calibrating to units of NOs or NO3 i 5 After cleaning the sensor according to step 2 apply the SLOPE solution as in step 3 After the readout has stabilized pull the rubber plug and use the driver end of the tweezers to adjust the SLOPE until the display reads value on the bottle i e 20 x 1 Again be mindful of the units 6 Rinse the sensor and blot dry as in step 2 Repeat and blot dry Note If the meter is new or has not been used recently repeat the calibration with both stan dards 7 The meter s calibration can be checked when desired Drip 3 to 5 drops of either calibration solution onto the sensor pad making sure both electrode dots are covered Recalibrate if the display does not read 1090 of the desired value 8 Replace the slope adjusting plug MEASUREMENT PROCEDURE 1 Measurement can be aided by placing the sample onto a piece of sampling sheet Using the pipette included in the case transfer 3 to 5 drops of the pressed plant liquid onto the sensor pad sampling paper may also be placed on the sensor and saturated with the liquid Note the plant sap press may be ordered from Spectrum Technologies Inc or your distributor 2 After the value has stabilized 30 to 45 seconds read the results from the display Note that the reading may be in units of NO or NOs N depending on how th
13. ily pack the beaker Place the sample into a cup or beaker Add 2 equal volumes of distilled water into the cup mix the sample and wait 10 minutes Measure the nitrate after sieving out the large particles The nitrate level can be read directly from the slurry Saturated media extract method Place 300 to 500 ml 1 to 2 cups of root media sample in a cup or beaker Slowly add distilled water constantly stirring the sample with a spatula or knife Add enough dis tilled water sot that the sample behaves like a paste with the surface glistening with water but with no free water on the surface of the sample After 15 minutes add more water if needed Extract the solution from the media using a pi pet buchner funnel side arm flask and vacuum pump or for the flat electrode meters a filter bag or sieve Make any additional measure ments such as EC using the extracted solu tion Table 2 gives a general idea of the nitrate levels to look for in the extracted solution ppm NO N Media Type in extract Seedlings 40 70 Young pot and foliage plants 50 90 Pot and bedding plants growing on 80 160 Roses mums or snapdragons in ground or raised beds 120 200 Lettuce and tomatoes in ground beds 125 225 Celery transplants 75 125 Table 2 Interpretation of Greenhouse Soils De sirable N concentrations in saturated media extract MEASUREMENT OF TISSUE SAP Sample Collection When conducting a test on
14. iole NO3 N concentration Fresh Sap 1000 1600 800 1200 600 1000 1200 1500 1000 1200 700 900 1000 1600 800 1000 700 800 1000 1600 700 1000 500 800 600 800 400 600 400 600 300 500 350 500 900 1200 700 1000 700 1000 700 900 1300 1600 900 1200 550 700 600 700 700 900 600 800 500 700 400 600 1000 1600 700 900 500 700 Petiole Sufficiency Levels Crop Cucumber Broccoli amp Collards Summer Squash Muskmelon Tomato field Bell Pepper Eggplant Potatoes Crop Annual Hill Strawberries October planting Watermelon Source University of Florida Growth Stage First blossom Fruits 3 inches long First harvest Six leaf stage Just prior to harvest At first harvest First blossom First harvest First blossom Fruits 2 inches long First harvest First buds First open flowers Fruit 1 inch diameter Fruit 2 inch diameter First harvest Second harvest First flower buds First open flowers Fruits half growth First harvest Second harvest First fruit 2 inches long First harvest Mid harvest Plants 8 inch tall First open flowers 5090 of flowers open 100 of flowers open Growth Stage November December January February March April Vines 6 inches long Fruit 2 inches long Fruits half mature First harvest 12 NO N ppm Fresh Sap 800 1000 600 800 400 600
15. ion Accessories SPECIFICATIONS lon electrode method LCD digital display 10 to 101 meters can be used beyond this range 20 of indication value 41 to 95 F 5 to 35 C At ambient temperature 0 99 x 100 ppm 9 900 ppm 1ppm for 0 99 ppm 10ppm for 10 99 x 10 ppm 100ppm for 10 99 x 100 ppm 2 CR 2025 lithium user replaceable Approximately 500 hours continuous use 1 4 072 approximately 40 g 2 point calibration by STD SLOPE controls using standard calibration solutions Sampling sheets tweezers pipet seals rinse bottle and carrying case THIS EQUIPMENT HAS BEEN TESTED AND FOUND TO COMPLY WITH THE LIMITS FOR A CLASS B COMPUTING DEVICE PURSUANT O SUBPART J OF PART 15 OF FCC RULES METER COMPONENTS AND ACCESSORIES Power Switch Sensor cover B Standard STD solution Gensor pad 3f Standard SLOPE solution SLOPE volume Sampling sheet METER FUNCTIONS 1 Power Switch Turns the power ON or 7 Battery box contains two CR 2025 OFF lithium cells A B shows up in the display if the batteries are low 2 STD dial calibrates the Cardy with Standard 8 Tweezers Use for handling sample sheet Use the head of the tweezers for 3 SLOPE volume Calibrates the to adjusting the SLOPE volume screw the SLOPE calibration solution 9 Sampling sheet Use for measuring 4 LCD display Expressed as ppm NO3 samples and calibrating meter Assures
16. onds after the solution has been placed on the sensor pad when calibrating or making a reading A functional sensor should reach a stable reading during that time 4 When measuring a sample make sure that the sample is covering the two black round sensors in the sensor pad The ion concentration cannot be measured if the electrodes are not covered by the sample 5 Use clean tweezers to handle the sampling sheet 6 In order to obtain measurement values of high repeatability maintain identical conditions as much as possible 7 Itis normal to see some liquid on a spot of the small electrode Simply rinse and blot the elec trode dry Any kind of soft wiping tissue or paper towel may be used to blot the sensor dry after rinsing Don t press the sensor pad with undue pressure Sx Don t scratch the sensor pad Don t drop the CARDY or don t apply undue pressure Don t allow the CARDY to become wet Don t measure hot samples over 40 degrees Don t place the CARDY in direct sunlight or in hot or humid places Don t put the CARDY directly into the solution in a beaker etc CALIBRATING SOLUTIONS NO nitrate versus NO N nitrate nitrogen The sensor of the Cardy meter measures NO nitrate ion activity similar to the way a pH sensor measures ion activity De cide whether you desire the meter LCD dis play to express the sample concentration as NO nitrate or NOs N nitrat
17. plant materials the biggest source of error is due to sampling This error results when a sample is not representative of the source Follow these steps to gather and care for your sample 1 Do not sample plants which show obvious signs of nutrient deficiency or damage from disease insects or chemicals unless these plants are the subject of a study Plants which have been under stress for a period of time may not give a true picture of the nutrient status of the field 2 The leaves or parts of leaves selected should be of the same age and relative position on the plant The most recently matured leaves should be used These are the leaves that have stopped expanding in size The petiole or leaf stem of the leaf or appropriated plant material should be used for the test 3 A minimum of 25 petioles or leaves should be collected This is enough to represent a five to ten acre field if the field is judged to be uniform Chop up the petioles and mix and sub sample these pieces for testing Crops with small dry petioles such as strawberries require much larger samples to get enough sap compared to fleshy crops such as tomatoes Store whole petioles not leaves at room temperature for up to 112 hours or on ice for up to eight hours Cold petioles should be warmed to room temperature before taking a measurement Measurement Procedure 1 Use a plant sap press to squeeze sap from the petioles Use the sub sample from step 3
18. rement as indicated above If the sample concentration ex ceeds 9900 the meter will display will read Dilute the sample with distilled water at a ratio of 1 9 1 part sample to 9 parts water and re measure Multiply the meter reading by 10 to adjust for the dilution Petiole NO3 N Sufficiency Levels For Drip Irrigated vegetables Source UC Davis Crop Broccoli Cabbage Canteloupe Cauliflower Celery Lettuce Onion Pepper Potato Russet Burbank Sweet Corn Tomato Watermelon Growth Stage Mid growth Button formation Preharvest Cupping Early heading Mid heading Early flower Fruit bulking First harvest Mid growth Curd development Preharvest Mid growth Preharvest Early head formation Preharvest Bulbs 0 5 1 5 in Vegetative growth Early flower fruit Fruit bulking Preharvest Early vegetative Mid tuber bulking Late tuber maturation Entire season Vegetative growth Early flower fruit Fruit bulking Preharvest Early flower Fruit bulking Fruit harvest 11 Dry Tissue 10 000 20 000 8000 15 000 5000 8000 12 000 15 000 8000 10 000 4000 6000 7000 10 000 6000 10 000 7000 10 000 6000 8000 7000 10 000 5000 8000 5000 8000 5000 7000 17 000 22 000 11 000 15 000 6000 8000 10 000 14 000 9000 12 000 6000 8000 4000 7000 12 000 15 000 8000 15 000 5000 8000 Pet
19. t ppm N N application Rate Ibs Acre 10 160 120 11 12 150 80 13 14 125 80 15 17 100 40 18 20 60 40 gt 21 0 0 consult WMEX 2809 Pennsylvania Nitrogen Soil Test Recommendation Lbs N Acre Source Penn State University Corn Yield Goal Soil Test Level ppm NO N 100 125 150 175 200 0 10 100 130 160 190 220 11 15 75 100 125 150 150 16 20 50 75 100 125 125 21 25 25 50 75 100 100 25 0 0 0 0 0 Note Check you county extension office for updates 15 SERVICE AND SUPPORT For technical service and support call your distributor or Spectrum Technologies Inc at 815 436 4440 When calling for technical support have a detailed explanation of the problem that you are experiencing The more information you can provide the faster and easier a technical support person will be able to assist you MAINTENANCE Battery When the meter LCD display shows the battery symbol B batteries need replacing To replace batteries turn the meter over and remove the circular battery cover Release the cover by placing a coin in the slot and turning it in the direction shown to open Place new batteries CR2025 with the positive terminal up and under the metal tab Replace the battery Replace both batteries at the same time Do not throw old batteries into a fire Do not leave old batteries in reach of children If a child does accidentally swallow a battery cell call a do
20. t provide increased management of N offer significant eco nomic benefits to plant growers of all types In addition applying just the right amount of nitrogen at the right time can help safe guard the environment by reducing the amount of residual soil nitrate NO available to leach into ground water The Cardy Nitrate meter completely new concept in sample measurement This self contained digital meter delivers high quality answers to ni trate level questions in soils plants and water based solutions presents a The replaceable flat sensor makes the measurement of small samples much more convenient When replacement of the sensor is required the sensor cartridge snaps in and out of the meter at a touch The readout of the measurement value is an LCD display It a has a total display range of 0 9900 PPM This is provided by three automatically switched ranges the X 1 range 0 99 ppm the X10 range 100 990 ppm and the X 100 range 1000 9900 ppm To get the final value you simply multiply the reading on the LCD display by the proper number 1 10 or 100 as indicated by the small arrow on the right side of the display window The read out can represent either NO nitrate or ni trate nitrogen N depending on how the meter was calibrated Principle Readout Guaranteed Range Repeatability Ambient Temperature Compensated Sample Temperature Display Range Resolution Power Weight Calibrat
21. under our warranty Product Return If for any reason you are not satisfied or the meter has failed and you need to return the product for service you will need to contact Spectrum Technologies Inc Before returning a failed unit you must obtain a Returned Goods Authorization RGA number from Spectrum You must ship the product s properly packaged against further damage back to Spectrum at your expense with the RGA number marked clearly on the outside of the package Spectrum is not responsible for any package that is returned without a valid RGA number or for the loss of the package by any shipping company Spectrum Technologies Inc 23839 W Andrew Rd Plainfield IL 60544 800 248 8873 or 815 436 4440 Fax 815 436 4460 E Mail SpecMeters aol com Website www specmeters com
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