Conductivity Calibration Standard 3-Pack — 500 mL (1.06 Pint) Each: 84 μS, 1,413 μS and 12,880 μS

$19

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

$11.99

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

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

$10.9

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

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

$18.24

YINMIK 12.88 mS/cm Calibration Solution, Conductivity Salinity Calibration Fluid for Salinity Tester, EC Meter, TDS Meter, 7 in 1 Tester Standard Calibration, 4 Bottles of 50mL

$9.99

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

$9.99

Neptune Systems Apex Conductivity Calibration Solution, 53.0 mS

$40.05

BlueLab 2.77EC Conductivity Solution, PH 7.0, and PH 4.0 Calibration Solution Set 250 Milliliters

$15.99

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

$13.19

Oakton WD-00653-00 Oakton Zero Oxygen Calibration Solution, 500 mL Capacity

$272.99

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

$10.99

Continuum Reagents Refractometer Calibration Standard – Seawater Reference for Calibration of Density Measuring Equipment, 60 ml

$20.99

Hanna Instruments HI70024P 35 PPT Salinity Calibration Solution Single Sachet

$12.99

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

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

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

$199

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

E ESEASONGEAR WWW.ESEASONGEAR.COM 3x20ml 800 ppm TDS Calibration Solution, milwaukee/m10080/hanna/hi70080

$34.73

Abuycs Salinity Refractometer for Seawater and Marine Fishkeeping Aquarium, Saltwater Tester Hydrometer, Dual Sacle 0-100ppt & 1.000-1.070 Specific Gravity with ATC Automatic Temperature Compensation

$14.99

Dual Scale Salinity Refractometer ATC 0-100ppt (0-10%) & 1.000-1.070 Specific Gravity, Portable Meter Tester for Seawater Salt Sea Water Aquarium Brackish Reef Tank Marine

$9.99

PreAsion Liquid Level Transmitter Submersible Water Level Transducer Sensor with 65.62ft/20M Cables 24-32V DC， 4-20mA 316 Stainless Steel

$59

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

Solimeta Water Meter, Cold Water Meter for Garden and Home, 3/4"NPT Couplings, Measuring in Cubic Meter

$118.42

Ohaus ST10C-B Conductivity Pen Meter, Waterproof, 0-1999 μs/cm

$385

Extech EC400 ExStik Waterproof Conductivity, TDS, Salinity, and Temperature Meter

$8.99

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

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

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

$18.99

Fluval Sea Hydrometer for Aquarium, Medium

$16.99

AUTO METER 5437 Pro-Comp Electric Water Temperature Gauge , 2 5/8"

$101.99

HORIBA 514-23 Standard Solution Conductivity12.9 mS/cm for LAQUAtwin EC Series (Bottle of 6)

$18.99

2" 52mm Water Temp Gauge 40-120 Celsius /100-250 Fahrenheit Pointer Auto Water Temp Temperature Gauge White Led Car Meter with Sensor

$13.96

Submersible Level Sensor 4-20ma,4-20ma 2m Pressure,Sensors TL‑136 Liquid Level Transmitter Water Level Sensor Detector 24VDC 4‑20mA Output (Range 0-3 Meters)

$14.99

bluelab GL56732898 PH 4.0 Calibration Solution, 500 milliliters lab-Chemical-Standards, Natural

$249.99

HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout Accuracy (Magnetic Body)

$16.39

HM Digital COM-80 Electrical Conductivity (EC) and Total Dissolved Solids Hydro Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, 2% Readout Accuracy

$23.02

bluelab 732899 2.77EC Conductivity Solution, 250 milliliters Industrial-Products, Clear

$12.9

Bluelab pH 4.0 Calibration Solution 250ml 732897

$10.45

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

WeAQUA TDS Meter AI-Supported Self-Calibrating for Accurate Results - Total Dissolved Solids Meter- Water Quality Meter Ideal for Drinking Water, Aquariums, Hydroponics, TDS and PPM Measurement

$119.99

YSI-605203 Pro Series Polarographic Dissolved Oxygen Sensor

$236.66

Saltwater Meter Salinity Meter Digital Water Tester Hydrometer Ideal for Hydroponics Aquarium Fish Pond Aquaculture High Accuracy Pen Type Meter Specific Gravity(SG) Salinity and Temperature 3 in 1

$15.16

Saltwater Meter Salinity Meter Digital Water Tester Hydrometer Ideal for Hydroponics Aquarium Fish Pond Aquaculture High Accuracy Pen Type Meter Specific Gravity(SG) Salinity and Temperature 3 in 1

$9.99

Extech EC500 Waterproof ExStik II pH/Conductivity Meter

$11.99

Water Depth Sensor (Liquid Level Sensor), 32Ft. (10 Meter)

$13.48

Auto Meter 4431 Ultra-Lite Mechanical Water Temperature Gauge , 2 5/8"

$90.56

Fluke Calibration 9100S-A-156 HDRC Handheld Dry-Well Hi-Temperature Calibrator, Block A, 35 to 375°C Temperature Range, 115V

$306

Auto Meter 4331 Ultra-Lite Mechanical Water Temperature Gauge, 2 1/16"

$89.3

Auto Meter 5837 Phantom Electric Water Temperature Gauge, 2 5/8"

$155.99

Auto Meter 4332 Ultra-Lite Mechanical Water Temperature Gauge , 2 1/16"

$90.56

bluelab 732901 2.77EC Conductivity Solution, 500 milliliters Industrial-Products, Clear

$12.9

Oakton AO-00606-10 Oakton Conductivity and TDS Standard, 12,880 Μs; 500 mL

$9.95

HORIBA LAQUAtwin EC-22 Compact Conductivity Meter 3999960126 Measurement Range 0-199.9 mS/cm

$52.9

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

Instant Ocean SeaTest Hydrometer

$10.99

HORIBA LAQUAtwin EC-11 Compact Conductivity Meter Range 0-19.99 mS/cm

$20.59

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

Dakota Digital 1/8" NPT Universal Water Temperature Sensor 0-300F SEN-04-5

$15.99