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Greetings ThRoewer and Small Heavens. Thank you for advice and some direction. I'm such a moron I actually trusted a student at Aquarium Services to calibrate my new refractometer. It being an important gauge I didn't want to risk it myself. Some online reading said distilled water should read zero PPT. Is this true? I tested some and The distilled water read 3 PPT. 1st thing I'm going to do is learn how to properly calibrate the refractometer myself. What good is a reference tool if it's not accurate?
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