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#1
12-10-2020, 05:10 PM
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Refractometer Calibration - Lesson Learned
Thought I'd share a lesson learned recently.
I didn't know you should calibrate your refractometer with a special solution. I'd been using tap water for decade without realizing it. I had usually kept a pretty simple tank until recently. Bought the calibration fluid and realized I had been running at less than 1.020. Slowly correcting to 1.025 now but I wanted to share in case it helps someone. Maybe it is time to move to a digital salinity checker? Recommendations? 
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#2
12-10-2020, 06:09 PM
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Wouldn't it be OK to recalibrate using RO or distilled water and ensuring that it reads zero?
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#3
12-10-2020, 08:56 PM
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I found a ton of topics and it sounds like the further from 35pt you calibrate from the greater the level of inaccuracy.
http://www.reefcentral.com/forums/sh....php?t=2644005
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