So I finally decided to get a refractometer and it came today. When I was testing it out I saw that when you are looking through the lens it says 20c. Is that the temperature of the water you have to test or can you change that temperature?
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YesDid you get one that has ATC (auto temperature compensation)?
Good deal. Thanks!put your water sample on the lens and let it sit for a few seconds to adjust temp and youre good.

