How to Calibrate Refractometer for your saltwater reef aquarium - The proper way!
Calibrating a Refractometer correctly is important - HUGE DEBATE!
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PERFECT Reef Tank Salinity! How To Guide - FAST, EASY and Reliable!
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How to calibrate a portable refractometer - step by step example
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How to PROPERLY test salinity in your saltwater aquarium!
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Refractometer - Using & Calibrating The Easy Way!
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THE MOST IMPORTANT TOOL! Using a Refractometer for Brackish and Marine Aquariums
