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15Pcs TDS EC Temp Meter 3 In 1 Thermometer Pen Tester Water Purity PPM Filter

$ 89.27 $ 53.56

Hagan Conductivity Meter: Model BW2

$ 17.59 $ 10.55

ESD Engineered Systems & Designs Soluble Salts Model 78 conductance TDS meter

$ 52.8 $ 31.67

DT-9880M Particle Counter Air Quality Detector Air Temperature Tester Gas Detect

$ 1183.59 $ 710.16

Digital Conductivity TDS Temperature Meter Cond Tester Water Quality Monitor

$ 352.44 $ 211.46

ABB AX400 Monitor

$ 118.8 $ 71.28

NEW George Fischer Signet 3-8800.103-2P Conductivity Transmitter 0.05 3-8800

$ 88 $ 52.8

2 in 1 PH ORP Meter Controller Monitor with Separate Relays Water Quality Tester

$ 109.29 $ 65.57

Digital PH Tester 2 In 1 LCD Temp Meter Aquarium Pool Water Wine Urine Analyzer

$ 28.96 $ 17.38

SDI CS42 PROBE conductivity SENSOR TEMP K=0.01 10K TC (01/03) 9" L NEW 9

$ 131.12 $ 78.67

100Pcs PH Tester Pen Design Digital Backlight Auto Calibration Water Acid Meter

$ 989.95 $ 593.97

Digital pH Meter Backlight Tester Large Screen ATC Water Quality pH Buffer Power

$ 19.57 $ 11.74

Water Quality Tester 7 In 1 pH Salinity EC SG TDS Temp ORP Framing Cooking Meter

$ 20.35 $ 12.21

High Accuracy Erma Online Portable pH Meter pH 025M 4 Digit Led Display

$ 52.79 $ 31.67

IQ Scientific IQ160 pH Meter with pH Probe and Case

$ 175.12 $ 105.07

Pen type TDS Tester Meter 0.5 to 100.0ppm Range Temp Meter Pure Water Analyzer

$ 70.48 $ 42.29

HORIBA LAQUA F-72 Benchtop pH/Water Quality Analyzer W/O Probe

$ 423.27 $ 253.96

Pocket Conductivity Meter TDS Temp Meter Waterproof 1 to 3 Points Calibration

$ 114.84 $ 68.9

Blue Digital TDS&EC Meter Tester EC-1 Aquarium Water Quality Test Pen 0-9990ppm

$ 4.74 $ 2.84

Portable Pen Type Digital PH Meter CT-6020A with PH Electrode.

$ 77.73 $ 46.64

OMEGA CDH-287 PORTABLE CONDUCTIVITY / RESISTIVITY / TDS / SALINITY METER (REF01)

$ 324.72 $ 194.83

Thermo Scientific Orion3 Star PH Benchtop Meter

$ 391.6 $ 234.96

Benchtop Water Quality Meter

$ 396.88 $ 238.12

Benchtop Conductivity Meter

$ 301.83 $ 181.1

Orion ionalyzer ammonia electrode model 95-10

$ 17.6 $ 10.56

Orion 230A pH Meter *For Parts/Repair*

$ 7.39 $ 4.43

OAKTON WD-35641-51 Ph Meter Electrode, Cole Parmer

$ 92.48 $ 55.49

CROATIA DIY Project ELECTRICAL CONDUCTIVITY TESTER Collectable Yugoslavia

$ 30.8 $ 18.48

YSI 3403 Glass Dip Conductivity Cell k=1.0/cm, k=100/m Modified Lead 3400 Series

$ 96.8 $ 58.08

THERMO SCIENTIFIC ORION 3 STAR PH PORTABLE ~ PARTS - I

$ 87.99 $ 52.79

AZ9861 AZ Ph Meter Water Quality Analyzer Electronic Data Logger With Printer

$ 256.34 $ 153.8

DELTA OHM CONDUCTIVITY METER HD8706

$ 249.92 $ 149.95

Digital Water Quality Measurement Tool Ec Meter Backlight Conductivity Tester

$ 13.19 $ 7.91

AZ86501 Acidity Tester Laboratory Tester PH Meter Industrial Desktop pH Meter

$ 388.96 $ 233.37

Hach Sension1 Sens ion 1 Conductivity Meter with probe, not fully tested

$ 158.39 $ 95.03

Portable Pocket Milk Cheese Soil Food Purity Monitor Electrode Tester Ph Meter

$ 36.95 $ 22.17

Shinwa Soil Acidity Meter pH Meter Tester A 72724 w/ tracking from Japan

$ 57.83 $ 34.7

Hach Singlet PH Buffer Solution Calibration Packs 7.00 and 4.01 Lot

$ 15.84 $ 9.5

5Pcs Water Quality Tester 3 In 1 TDS EC Temperature Meter Pen Multi-parameter

$ 176.99 $ 106.19

Thomas & Skinner Model 7381 Fluxmeter Analog Display

$ 66 $ 39.6

WTW TetraCon 96 301245 4-electrode Conductivity Cell Integrated Tem Sensor Probe

$ 367.84 $ 220.7

Elmacron LF 1004 / LF1004 Conductivity Meter 0-10ms

$ 703.12 $ 421.87

PH-100A accuracy 0.01 Digital Waterproof PH Meter Test Pen with LED Display

$ 56.21 $ 33.72

ORP Meter Redox Potential Tester Digital Water Quality Monitor Negative Filter

$ 38.36 $ 23.02

*LARGE LOT* YSI 600XLM Multiparameter Water Quality Sonde Monitor 85/10FT 650MDS

$ 6863.99 $ 4118.39

Apera Instruments LabSen 331 pH Combination Electrode

$ 59.84 $ 35.9

Tester measuring instrument probe head PH Meter 2051 Testo 205 for food 0563

$ 192.69 $ 115.61

Digital PH Tester Temperature Controller Meter LCD Water Aquarium Pool Monitor

$ 170.72 $ 102.43

Waterproof EC TDS PH TEMP Meter 4 In 1 Tester Digital LCD Calibration Monitor

$ 153.49 $ 92.09

Standard pH Meter, PHM, Radiometer

$ 5.27 $ 3.16

Digital PH Meter Soil Acidity Tester Pen ATC Backlight Aquarium Water Analyzer

$ 58.73 $ 35.23

Benchtop pH Meter Digital Lab Acidity Meter with Measurement Range 0 to 14.00pH

$ 114.84 $ 68.9

NEW Testo 206-PH1 PH Meter Tester measuring instrument probe head for liquids

$ 125.69 $ 75.41

5Pcs Digital PH EC Meter 2 In 1 Tester Pen Type Multi-parameter Water Monitor

$ 284.29 $ 170.57

PRIMO5 / #O 1A8 meter 4386

$ 65.12 $ 39.07

Elmacron 1005RE pH Meter Controller

$ 439.12 $ 263.47

Digital PH Meter Waterproof Temperature Calibration Water Quality Pen Tester

$ 111.98 $ 67.19

Digital EC TDS Meter Temperature Tester Waterproof Automatic Calibration Tool

$ 106.5 $ 63.9

10Pcs TDS Meter Pen Water Quality Tester LCD Display Digital Aquaculture Tool

$ 133.13 $ 79.88

Folding Salinity Tester Digital 3 In 1 Aquaculture Pool SG Temperature Meter

$ 110.42 $ 66.25

Water Quality Tester 6 In 1 PH Meter Temperature EC CF RH TDS Digital Test Kit

$ 119.82 $ 71.89

PH-10 accuracy 0.1 Digital Waterproof PH Meter Test Pen with LED Display

$ 45.86 $ 27.51

TDS Meter Water Quality Purity Tester Portable Detection Digital EC Analyzer

$ 15.65 $ 9.39

Orion Research Digital PH/MV/Temp Meter Model 231 in Case

$ 17.6 $ 10.56

OMEGA MODEL CHD-70 CONDUCTIVITY METER

$ 44.13 $ 26.47

AZ8302 Conductivity Tester Conductivity Meter With RS232 Interface

$ 239.36 $ 143.61

Skin Ph Acidometer 2 In 1 Temperature Meter Automatic Calibrating Lab Tester

$ 42.28 $ 25.37

ORP Meter 3 In 1 pH TEMP Tester Backlight Multi-parameter Water Quality Monitor

$ 54.03 $ 32.41

VWR Scientific 8000 pH Temperature Meter w Beckman 511080 Probe - Parts Only

$ 21.78 $ 13.06

Digital pH Meter LCD Pen Aquarium Water Wine Urine Automatic Calibration Tester

$ 18 $ 10.8

Digital PH EC TDS Meter Temperature Pen Water Purity Filter Hydroponic Tester

$ 21.13 $ 12.68

Pen-type pH Meter 0.01pH Accuracy Liquid Acidity Aquarium Spa Laboratory Tester

$ 18 $ 10.8

Digital TDS Meter Water Quality Tester Aquariums RO System Swinging Pool Monitor

$ 14.87 $ 8.92

Digital PH Meter Pen Tester 0.01 Drinking Water Soil 2 Standard Buffer Powders

$ 14.87 $ 8.92

2Pcs Water Quality Tester TDS PH EC Temperature 4 In 1 Hydroponics Pool Meter

$ 22.7 $ 13.62

PH EC TDS Temp Meter 4 In 1 LCD Digital 0.01 Water Food Aquarium Pool Tester

$ 31.31 $ 18.79

Digital pH PH TDS EC Temperature Meter 4 In 1 Function Pool Water Quality Tester

$ 39.15 $ 23.49

2Pcs Digital PH Meter TDS EC Tester LCD Portable Pen Water Purity PPM Filter

$ 23.48 $ 14.09

Digital PH Meter 0-14 LCD Water Tester Food Aquarium Hydroponics Pocket Tester

$ 16.43 $ 9.86

Digital pH TDS Combo Meter High Accuracy Readout Water Quality Household Tester

$ 21.13 $ 12.68

Digital PH TDS Meter LCD Tester Drinking Water Aquariums Swimming Pools Analyzer

$ 14.08 $ 8.45

PH TDS EC ORP Salinity SG Temperature Meter Digital Tester Water Quality Monitor

$ 43.85 $ 26.31

2Pcs Digital TDS Meter Water Quality Tester Temperature EC 4 In 1 Monitor Kits

$ 17.22 $ 10.33

YSI 3403 Glass Dip Conductivity Cell k=1.0/cm, k=100/m Modified Lead 3400 Series

$ 96.8 $ 58.08

Digital PH Tester Food Meat Meter Electrode Water Milk Cheese Soil Analyzers

$ 54.81 $ 32.88

Liquid PH Value Detection Sensor Module Electrode Probe Monitoring Control Board

$ 21.92 $ 13.15

HANNA INSTRUMENTS BL983329 TDS CONTROLLER 10VA 115/230Vac / FAST SHIPPING

$ 131.12 $ 78.67

Oakton Waterproof Hand-Held pH/Conductivity/Temperature Meter PC 10 Series

$ 88 $ 52.8

Digital PH EC Meter 2 In 1 LED Tester Tools Drinking Water Monitoring Equipment

$ 84.57 $ 50.74

3Pcs TDS EC PH Tester Pen Design Measurement Water Acid Quality Digital Meter

$ 27.4 $ 16.44

PH Salinity Meter 2 In 1 Monitor Seawater Aquarium Pool Spa Water Quality Tester

$ 75.96 $ 45.57

Waterproof PH Meter Pen-type Digital 0.01 Accuracy Aquarium Water Quality Tester

$ 32.1 $ 19.26

pH Meter High Precision Auto Correct Portable Digital Water Quality TDS Tester

$ 33.66 $ 20.2

Digital TDS Tester Portable Pen Aquarium Water Quality Purity Backlight Meter

$ 19.57 $ 11.74

Waterproof pH Tester 2.1~10.8 Hydroponic Dipstick Meter Large Tank Pool Monitor

$ 43.06 $ 25.84

Waterproof PH Meter Digital LCD Display Temperature Auto Water Quality Tester

$ 42.28 $ 25.37

10Pcs TDS EC Tester Digital Water Quality Temperature Handheld Aquarium Meter

$ 57.16 $ 34.29

PH Temperature Meter 2 In 1 Acidity Tester Digital Water Quality Monitor Tools

$ 32.1 $ 19.26

Digital PH Meter Backlight Automatic Calibration Laboratory Water Quality Tester

$ 39.93 $ 23.96

Digital PH Meter LCD Pen Accuracy 0-14 Household Drinking Water Quality Tester

$ 19.57 $ 11.74