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The unique design of the Energy Savers Unlimited Deep Six Hydrometer allows hobbyists to take water samples at six inches in depth without submerging their hands in the water, thus avoiding the possibility of contamination.
Samples taken at six inches in depth have been proven to result in a more accurate salinity reading than surface samples.
Every unit is calibrated, tested and certified for accuracy. Each Deep Six Hydrometer is then assigned its own individual certification number.