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

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Exo Terra Digital Thermometer with Probe, Celsius and Fahrenheit

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Fluval Sea Hydrometer for Aquarium, Medium

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

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Exo Terra Terrarium Hydrometer

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Hanna Salinity Tester HI98319

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Tilt Wireless Purple Hydrometer and Thermometer: Patented Brewing Technology for Precision Monitoring & Control for Fermentation of Beer, Wine, Cider, Mead & More

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Newest Smart Aquarium Monitor All in One pH/ORP/Salt/S.G/TDS/EC/Temp 24h Online Freshwater and Saltwater Fish Tank Tester (WiFi Version)

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Hydrometer - Triple Scale Hydrometer for Home Brewing - Beer and Wine

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East Penn Manu. Deka Battery Tester - Hydrometer

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hygger Aquarium Gravel Cleaner, New Quick Water Changer with Air-Pressing Button Fish Tank Sand Cleaner Kit Aquarium Siphon Vacuum Cleaner with Water Hose Controller Clamp

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SALT-3050 Waterproof IP65 Meter, Digital Salinity PPM Temperature Tester for Salt Water Pool and Koi Fish Pond

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API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit

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Safe Home® 12-in-1 Drinking Water Test Kit – DIY Testing for Hardness, Copper, Nitrate, Fluoride, Iron, and More – City Taps or Well Water – 10-Strips Issue a Total of 120 Tests/Kit

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Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution (color may vary)

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Tilt Wireless Pink Hydrometer and Thermometer: Patented Brewing Technology for Precision Monitoring & Control for Fermentation of Beer, Wine, Cider, Mead & More

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Milwaukee Instruments MA887-BOX Digital Refractometer for Seawater Measurements with Protective Padded Hardshell

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Exo Terra Digital Hygrometer with Probe

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Hydrometer Alcohol Meter Test Kit: Distilled Alcohol American-Made 0-200 Proof Pro Series Traceable Alcoholmeter Tester Set with Glass Jar for Proofing Distilled Spirits - Made in America

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