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JOR Refractometer, Dual-Range Scale Device to Measure Salinity and Specific Gravity of Saltwater Aquarium and Reef Tank, Provides Accurate Reading, No Batteries Required, 1 Set per Piece : Amazon.ca: Pet Supplies
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Salinity Refractometer, ATC (Automatic Temperature Compensation) Sea Water Refractometer Meter Salimeter Measurement Tool for Aquarium and Seawater Monitoring, 0-10% (ATC Salinity Meter 0-10%) : Amazon.co.uk: Home & Kitchen
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Yieryi 4 In 1 Salt/ec/tds/temp Meter S-100 Salt Meter Salinity Tester Waterproof Saltmeter Salt Gauge Water Quality Measure Tool - Ph Meters - AliExpress
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Salinity & Temp Meter Pen Type Salt Water Quality Tester ATC NaCl, 9999 ppm / 100.0ppt/ 10% / 0.95-1.08 SG Measurement Units 4-in-1 Checker for Saltwater Aquarium Pond Food Pool Cooking Seawater :
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