YINMIK 111.8 mS/cm Calibration Solution, Conductivity Salt Standard Buffer Solution for 5 in 1 Salinity Tester, EC Meter, TDS Meter, 7 in 1 Multi-Parameter Tester Calibration, 4 Bottles of 50mL

$18.99

YINMIK 1413 μS/cm Calibration Solution, Conductivity Salt Standard Buffer Solution for 5 in 1 Salinity Tester, EC Meter, TDS Meter, 7 in 1 Multi-Parameter Tester Calibration, 4 Bottles of 50mL

$19.95

YINMIK pH Meter Calibration Solution Kit(4.00,7.00&10.01) with pH Protective Solution Kit,3 Bottles 50ml pH Calibration Buffer Solution and 2 bottels 10ml KCL pH Probe Solution for pH Meters

$7.99

YINMIK Dissolved Oxygen Test Kit Accessories 1 * 50ml Zero Oxygen Calibration Reagent 2 * 30ml Electrolyte Filling Solution and 6 pcs Membrane Groups for DO Meter Tester

$331.58

Chlorine Tester, YINMIK Pool pH Free Chlorine Meter, pH Salt Tester for Saltwater Pool and Aquarium, 7 in 1 pH Chlorine ORP Salinity EC TDS Temp Tester, Digital pH and Chlorine Tester for Hot Tub, SPA

$9.97

GISNPA PH Meter, 5 in 1 pH/TDS/EC/Salinity/Temp Meter, Waterproof Pool Salt Tester, 0.01 Resolution High Accuracy Water Tester for Drinking Water, Hydroponics, Saltwater Pool, Aquarium, Koi Fish Pond

$91.96

YINMIK 15 Pack PH Calibration Powder, 5 Each for PH 4.00, PH 7.00 and PH 10.01 Calibration Buffer Powder, PH Tester Calibration Packets for PH Meters

$14.95

Hanna Instruments HI70024P 35 PPT Salinity Calibration Solution (25 Pack) Sachet

$13.19

YINMIK pH EC Meter for Water Hydroponics, PPM Meter for Nutrients, Measure pH PPM Conductivity Temperature of Hydroponic Garden Water and Nutrient Solution, EC pH TDS Meter for Water, Aquarium, Pool

$42.99

Pool Salt Tester & PH Meter, Hofun Digital Salinity Meter and PH Tester for Pool Saltwater and Drinking Water, 5 in 1 Salinity PH Temp EC and TDS Meter Swimming Pool Hot Tub Spas, High Accuracy

$24.99

Yewhick Digital Salinity Tester for Saltwater, Waterproof Pool Salt Tester, 4 in 1 Salt/EC/TDS/Temp Meter, High Accuracy Saltwater Tester with ATC for Saltwater Pool, Aquarium, Koi Fish Pond

$9.99

Hanna Instruments HI7031L 1413 µs/cm Conductivity Calibration Solution, 500mL Bottle

$11.99

Apera Instruments SX751 pH/ORP/DO/Conductivity/TDS/Salinity/Resistivity/Portable Handheld Multiparameter Meter Kit, Silver

$236.99

Nynelly 15 Pack pH Meter Buffer Solution Powder pH 6.86, 4.01, 9.18 for Precise Calibrate pH Meter, pH Calibration Powder Solution, pH Tester Calibration Powder Packets

$22

RCYAGO PH Meter, 5 in 1 PH/TDS/EC/Salinity/Temp Meter with ATC, 0.01 Resolution High Accuracy Water Testing for Drinking Water, Hydroponics, Seawater, Aquariums, Fish Tank and Swimming Pools

$10.79

Bluelab Conductivity Pen Meter and Probe Care Kit for Conductivity-Water, Temperature and Nutrient Tester (CF, EC, PPM 500/700) with EC Solution and Cleaner for Hydroponics and Indoor Growing

$195.76

Bluelab PENCON Conductivity Pen and Digital TDS Meter, Water Tester for Temperature and Nutrient (CF, EC, PPM 500, PPM 700), TDS Testing Kit for Hydroponic System and Indoor Plant Grow

$29.9

Hanna Instruments HI70024P 35 PPT Salinity Calibration Solution Single Sachet

$12.99

TDS Meter Water Quality Tester,HASFINE Digital Conductivity Meter 3 in 1 TDS,EC and Temperature Meter, Accuracy Testing Pen 0-9999 PPM Meter for Drinking Water, Aquariums,Pool and More

$182.65

Apera Instruments 1413 µS/cm Conductivity Standard Calibration Solution, 16 oz.

$10.9

Hanna Instruments HI7032L 1382 mg/L (ppm) TDS Calibration Solution, 500mL Bottle

$18.99

YINMIK pH Meter, Digital pH Tester for Hydroponics, pH Temp Meter with Horizontal Display for Pool, Spa, Hot Tub, Indoor Plants, Koi Ponds, Drinking Water, Wine Beer Making, Aquarium, Aquaculture

$24.69

0-28% Salinity Refractometer ATC, Sodium Chloride (NaCl) Salt Level Meter Tester, Test Kit for Sea Water Brine Seawater Food Industry Pickle Soy Sauce, ±0.2% Accuracy

$15.99

Digital Salinity Tester, 7 in 1 PH/TDS/EC/Salt/S.G/ORP/Temp Tester, Backlit Waterproof LCD Salt Water Tester, Suitable for Pools, Drinking Water, Aquariums, Hydroponic Cooking, Etc.

$22.79

Pool Salt Tester pH Meter ORAPXI Salinity Meter and pH Tester PPM EC Meter with LCD Screen 5 in 1- Salt pH TDS EC Meter for Saltwater Pool, Hot Tubs, Spas, Aquarium, Hydroponics System, Home Brew

$84

5 in 1 TDS Meter PH Tester, 0.01 High Accuracy Digital PH Meter for Water, PH/TDS/EC/Salt/Temp Tester, PPM Meter Water Tester for Drinking Water, Hydroponics, Plants, Aquarium and Pool

$12.97

Apera Instruments SX716 Portable Lab Dissolved Oxygen DO Meter, Waterproof, Automatic Temperature, Salinity Compensation and Calibration Silver AI461

$28.92

YINMIK Hydrogen Water Tester, 4 in 1 pH H2 ORP Temp Test Kit, Hydrogen Water ppb/ppm Meter, Dissolved Hydrogen Test Pen for Hydrogen Water Bottle, Accurate pH Hydrogen ORP Meter with ATC & Backlight

$6.99

Bluelab TRUNV2 Truncheon Nutrient Meter, Digital Conductivity Tester in Water (Scales Include: EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow, White

$37.99

Hydrometer & Testing Jar Kit by MiTBA Test the ABV, Brix & Gravity of your Wine, Beer, Mead & Kombucha accurately! Triple Scale Hydrometer + 250ml Plastic Graduated Cylinder + cleaning brush & cloth

$12.99

hygger Salinity Tester, Transparent Acrylic Aquarium Hydrometer Sea Specific Gravity Test Salinity Meter for Fish Tank Pond Water Saltwater Freshwater, Accurate Automatic Hydrometer

$23.99

TAICHEUT 2 Pack Calibration Weights, 2 KG High Precision Grade Scale Calibration Weight for Digital Scale, M1 Calibration Weights with Chrome Finish, Precision Steel, Silver

$8.69

WEBEST Aquarium Salt Tester -Pool Salt Tester, Versatile 5 in1 Salinity, PH, TDS, EC, and Temperature Meter, Digital Salinity Tester for Saltwater Aquarium, Accurate Salinity Meter,Grey

$8.99

NANBEI 0-32% Brix Meter Refractometer with ATC, brix Refractometer,Refractometer Honey,Portable Refractometer for Honey,ph Refractometer

$18.98

Glass Aquarium Hydrometer with Built-in Marine Floating Salt Water Salinity Tester 1.000-1.060 7.87in

$10.99

ACME Analytical Solutions pH 7 Buffer Solution, pH Calibration Solution, pH Meter Calibration Solution, NIST Traceable Reference Standard, Designed for All pH Meters, 3.8 Liter (1 Gallon)

$34.99

Atlas Scientific pH 4.00, 7.00, 10.00, & pH Electrode Storage Calibration Solution 125ml - 4oz (Pack of 4)

$22.54

Bluelab Calibration Solution pH 4.0, 7.0 and 2.77 EC Conductivity Solution, 500 ml Each

$18.24

YINMIK Digital pH Meter for Food, pH Probe for Sourdough and Bread Dough, Checking The pH of Fermenting Sausages and Salami, Waterproof pH Tester for Solid and Liquid Soft Soil Sample

$12.99

YINMIK Food pH Meter with Extra pH Replaceable Probe,Digital pH Tester for Sourdough and Bread,Food pH Tester for Meat,Canning,Cheese,Solid Samples, Soft Soil and Water

$26.99

PH Meter & TDS Meter Digital Water Tester 5 in 1 Salinity Tester PH Temp EC and TDS Meter,PH Meter for Water with LCD Backlit,Water Testing Kits for Drinking Water,Wine,Swimming Pool,Hot Tub Spas.

$59.99

Seawater Salinity Refractometer,V-Resourcing Automatic Temperature Compensation Sea Water Salinity Measurer for Aquarium, Hydrometer, 0-100ppt & 1.000-1.070 Salinity Specific Gravity

$27.99

ALLmeter Salinity Refractometer Saltwater Aquariums Dual Scale 0-100 PPT & Specific Gravity 1.000-1.070 Salinity Tester Meter with ATC Function for Marine Monitoring,Fish Farming,Pool Hydrometer

$9.99

Milwaukee Instruments MA9004 MA9007 MA9015 MA9016, 4 of 230ml Bottle, pH 4.01, 7.01 Buffer Calibration, Storage, Cleaning Solution Bundle

$17.99

Pinpoint® Salinity Meter Kit

$32.15

CANNABMALL PH Meter, TDS PPM Meter and 3 in 1 Soil Moisture Meter Combo, High Accuracy Lab PH/EC Tester Digital Kit [Upgraded] for Home Water, Hydroponics, Plants Garden Soil and Aquarium PH Pen

$22.79

YSI 060660 Supersaturated Sea Water Conductivity Calibrator Solution, 50000 uS/cm Range (Box of 1, 8 Pints per Box)

$34.52

CIHOPE pH and TDS Meter Combo, Professional pH Meter for Water pH Tester Digital pH Pen, 3-in-1 EC Temperature TDS Meter Digital Water Tester for Drinking Water, Hydroponics, Pool and Aquarium

$42.69

CENAP Telescopic Water Sampler, 500ml Water Sampling Dipper System, Ultra Light Rod Plastic Ladle Pendulum Beaker Sampler, for Environmental Monitoring, Water Quality Sample Collection

$148.06

pH Buffer Calibration Solution Kit 4-Pack — 250 mL (8.4 fl oz) Each: pH 4.00 Buffer, pH 7.00 Buffer, pH 10.00 Buffer, and Electrode Storage Solution — NIST Traceable Reference Standards

$39

Varify 17 in 1 Complete Drinking Water Test Kit - 100 Strips + 2 Bacteria Tester Kits - Well, Tap, Home, City Water Testing Strip for Lead, Alkaline, Chlorine, Hardness, Iron, Fluoride, Copper & More

$16.97

TDS Meter Digital Water Tester,WoEluone 3 in 1 TDS,Temperature and EC Meter,Accurate Ideal PPM Meter for Drinking Water, Aquariums,RO System and More

$34

AccuBrate Refractometer and Hydrometer Salinity Calibration Fluid – Solution to Accurately Calibrate Refractometer and Hydrometer for Testing Natural Saltwater or Synthetic Sea Water (60 ml)

$259

Digital pH Meter, pH Meter for Water, 0-14 pH Measurement Range pH Tester, 0.01 High Precision Water Quality Tester with ATC for Drinking Water Pool

$29.99

Surface Resistance Meter,Resistance Tester Meter Measurement Humidity Range 5% to 90% RH,Precise Static Handheld Surface Resistance Tester,Anti-Static Resistivity Meter

$286.5

CYCLOPS INSTRUMENTS Professional Salinity Premium Refractometer for Seawater, Marine Fishkeeping Aquarium, Pools, and Tanks, 0-100 PPT Salinity Tester with Automatic Temperature Compensation (ATC)

$9.19

APERA INSTRUMENTS AI1116 pH Calibration Solution Kit (7.00, 4.00, 10.01), 16 oz. Each, Plus a CalPod Solution Holder for Easy Calibration, NIST traceable

$7.96

Hydrometer and Test Jar for Wine, Beer and Kombucha - Including 250ml Plastic Cylinder, Cleaning Brush and ABV Storage Bag

$19.97

Assorted Wissmach - Oceanside System96 Fusible Glass Sampler Pack, 96COE - 4 Oz. - COE96

$24.99

AUTOUTLET Salinity Refractometer Saltwater Aquarium for Seawater, Pool, Tank, Marine, Fishkeeping, 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Salinity Hydrometer Kit

$9.99