Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy, Lcd display

$45.88

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

$236.99

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

$29.99

APERA INSTRUMENTS AI316 Premium Series PC60 5-in-1 Waterproof pH/EC (Conductivity) /TDS (ppm) /Salinity (ppt) /Temp. Multi-Parameter Pocket Tester Kit

$92.61

Apera Instruments, LLC-AI3719 PC60-Z Bluetooth Multi-Parameter Smart Tester Powered by ZenTest Mobile App, Measuring pH/Conductivity/TDS/Salinity/Resistivity/Temp.

$135

Apera Instruments, LLC-AI1312 Apera Instruments 201T-S pH/Temp. Electrode, 8-pin Connector, The Replacement Electrode for Apera 400/400S Series Portable Meters

$15.38

Extech EC500 Waterproof ExStik II pH/Conductivity Meter

$11.99

Apera Instruments pH Probe Electrode Sensor Care Maintenance Kit, Including pH 4/7/10 buffers, 3M KCL Soaking Solution, Probe Cleaning Solution, a CalPod Solution Organizer (AI1170)

$14.66

AC Infinity pH Meter PRO Kit, High Precision Digital pH Pen with ±0.01 pH Accuracy and Interchangeable Probe, Nutrient Test pH Meter for Water Hydroponics Plants, Gardening, Aquariums, Swimming Pools

$19.99

Apera Instruments, LLC-AI3719-E Apera Instruments PC60-DE pH/Conductivity Replacement Probe for ZenTest PC60-Z Smart Multi-Parameter Pocket Tester

$9.99

Apera Instruments LabSen 241-6 Professional Combination pH Electrode for Small Samples (>0.2 mL), BNC Connector, Lead-Free Glass

$783

Apera Instruments, LLC-AI1109 8oz. pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), plus 4oz 3M KCL Storage Solution for pH/ORP Electrodes

$8.99

Apera Instruments 12.88 mS/cm (12880µS/cm) Conductivity Standard Calibration Solution, 16 oz. (AI1131)

$9.99

Apera Instruments AI1113 pH Calibration Buffer Solution Kit (7.00, 4.00), 8 oz. Each

$7.99

Myron L TPH1 TechPro II pH/Conductivity Meter

$184.8

Apera Instruments AI480 DO850 Optical Dissolved Oxygen Meter Kit, with 10 Ft Optical DO Probe, Hassle-Free Testing Experience

$45.5

APERA INSTRUMENTS 201DJ-C Double-Junction pH Electrode, BNC Connector, 3 Ft Cable, PC Body

$5.53

Apera Instruments AI104G GroStar Series GS4 pH/EC/500ppm/700ppm Combo 5-in-1 Pen Tester Kit with Replaceable Double-Junction pH/EC Probe for Hydroponics Water Quality Testing, Gen II

$42.69

Apera Instruments, LLC-AI314 Premium Series EC60 Waterproof Conductivity Pocket Tester Kit, ±1% F.S Accuracy, Easy Switch of EC/TDS/Salinity, Replaceable Probe

$162.87

Apera Instruments 201T-F All-in-one pH Electrode, ATC, BNC/RCA Connector, Polycarbonate Body AI1302

$5.99

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

$28.92

Apera Instruments AI502 EC700 Benchtop Lab Conductivity/Temperature Meter, Plastic, 1% F.S Accuracy, 0-200.0 mS/cm Range, 1-4 Points Auto Calibration

$14.15

APERA INSTRUMENTS 201-C Combination pH Electrode, BNC Connector, Polycarbonate-Body (AI1301)

$7.97

Apera Instruments, LLC-AI481 TN400 Portable Turbidity Meter, Infrared Sensor, ISO 7027 Compliant, EPA Approved Standard Solutions for Easy Calibration, Accuracy: ±2%+Stray Light

$358

PmoYoKo Digital pH/TDS Meter with ATC pH Tester, 3 in 1 0.01 Resolution High Accuracy pH Pen Tester for Water with LCD Backlit, Tds Meter pH Meter for Drinking Water, Wine, Pool and Aquariums

$10.99

Apera Instruments TN500 Portable White Light Turbidity Meter with Data Logger, EPA 180.1 Compliant (AI483)

$379

VIVOSUN Digital pH and TDS Meter Kits, 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified

$29.99

Apera Instruments Value Series EC20 Conductivity (EC) Pocket Tester Kit, ±1% F.S Accuracy in 0 to 20 mS/cm, BPB Sensor

$8.99

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

$10.9

pH/EC Conductivity Meter with ATC Water Quality Tester 0.0-14.0pH / 0~19.99ms/cm Aquarium, Hydroponics Tool

$199

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

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

VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium, with ATC, Army Green

$95.24

PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium

$22.99

Hilitand PH Module Probe Kit, PH0-14 Value Detect Sensor Module + PH Electrode Probe BNC

$25.95

Digital pH and TDS Meter Kit - 0.01pH High Accuracy Pen Type pH Meter ± 2% Readout Accuracy - 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium (pH Meter Kit)

$89.54

Extech 601500 Standard pH Electrode

$7.99

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

2 in 1 Temperature pH Monitor Meter Tester Sensor Test Kit 0~14 pH Automatic Calibration BNC Electrode Probe for Hydroponic ph Aquarium Meter Water Lab Food Drinking Water pH of Saltwater/Seawater

$19.99

PmoYoKo Digital pH/TDS Meter with ATC pH Tester, 3 in 1 pH TDS Temp 0.01 Resolution High Accuracy pH Tester with LCD Backlit, TDS Meter pH Meter for Water, Wine, Pool, Hydroponics and Aquariums

$6.99

PH Meter, Digital PH Meter, PH Meter for Water, PH Tester 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range, PH Meter for Household Drinking Water, Aquarium, Swimming Pool, Spa

$17.19

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

DuvinDD 18 Pack pH Meter Buffer Solution Powder 6.86/4.00/9.18, pH Calibration Solution Packets for Precise PH Meter

$14.84

Apera Instruments LabSen 331 POM-Body pH Electrode for Wastewater Treatment, BNC Connector

$783

Apera Instruments AI102G GroStar Series GS2 Soil pH Pen Tester Kit for Direct Soil Test and Nutrient Solutions Test with Replaceable Swiss Spear pH Probe, Gen II

$9.99

pH/Oxygen Reduction Potential (ORP) Electrode Storage Solution, 250 mL (8.4 fl oz) — Suitable for All pH Meters — 1M KCl Solution — Keeps Your Probe Conditioned and Helps to Extend its Life

$6.99

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

Apera Instruments Premium Line ORP60 Pocket ORP Tester Kit, Replaceable Probe, 1 mV/±0.2% F.S Accuracy, ±1000 mV Range

$5.99

HM Digital EC-3 Handheld Electrical Conductivity (EC) Tester Meter with Case, 0 - 9990 µS Measurement Range, 1µS Resolution, +/- 2% Readout Accuracy

$15.99

Hanna Instruments HI 98121 Combination pH/ORP/Temperature Tester

$236.99

GISNPA Digital pH Meter for Food, 0.01 Resolution High Accuracy Food pH Tester with Backlit LCD Display and ATC for Meat, Bread, Canning, Brewing, Cheese, Solid Sampling, Soft Soil and Water

$11.99

15-Pack pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 6.86,4.01,9.18

$21.99

Hanna Instruments HI 98130 Waterproof pH/Conductivity/TDS Tester with ATC, High Range

$53.35

Bluelab CAREKITPH pH Probe Care Kit with Calibration Supplies, Storage Solution, and Brush, Used for Pen, Meter, Monitor, Controller and Tools for Hydroponic System and Indoor Plant Grow, Clear

$16.9

pH Buffer Calibration Solution Kit 2-Pack — one pH 4.00 (red) and one pH 7.00 (Yellow), Each 500 mL (1.06 Pint) — NIST Traceable Reference Standards for All pH Meters

$25.99

GISNPA 7 in 1 pH/TDS/EC/ORP/S.G/Salinity/Temp Meter with ATC pH Tester, 0.01 Resolution High Accuracy Digital pH Meter, Water Tester for Drinking, Hydroponics, Swimming Pool and Aquarium

$29.95

pH Buffer Calibration Kit: 2×250-mL (8.4 fl oz) Bottles, one pH 7.00 and one pH 10.00 — NIST Traceable Reference Standards

$39

pH Buffer Calibration Solution Kit 2-Pack — one pH 4.00 (red) and one pH 7.00 (Yellow), Each 250 mL (8.4 fl oz) — NIST Traceable Reference Standards for All pH Meters

$23

Litmus PH Test Strips 160 Strips, Professional Universal pH.1-14 Test Paper with Test Pipette Droppers, for Teaching, Student, Chemistry Experiment, Saliva Urine Water Soil & Diet pH Monitoring

$12.97

YSI DO200 Kit EcoSense DO 200 Dissolved Oxygen Meter Kit

$169.99