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Old 12/25/2007, 08:27 PM   #1
cyeater
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Refractometer

I just got my refractometer from premiumaquatics, the instructions are a little vague by all means, what is the best way to calibrate this? Thanks Its the BLUE model http://www.premiumaquatics.com/Merch...Category_Code=


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Old 12/25/2007, 09:58 PM   #2
Bri Guy
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Many use distilled water and adjust to 0

But there have been many people saying theres is off by .003 when calibrating this way.

So the best way is to get some 53ms salinity monitor solution and calibrate to 1.0265 or 35


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Old 12/26/2007, 09:48 AM   #3
boxfishpooalot
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I wouldnt trust Pinpoints fluid. I would make my own as of Randys instructions. Take it to a pharmacist and they will measure it exactly.

I had bought a pinpoint calibration fluid, and it was enormously off! I do not trust chemicals for fish tanks anymore!


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Its a good idea to have a refrence sample for alk test kits. 1.1350 grams of baking soda in 1gallon of distilled water=10dkh. Check your alkalinity test kit!
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Old 12/26/2007, 10:31 AM   #4
Boomer
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Box, the Pinpoint 53 mS fluid has been well tested by 100's of people and works the best. Even Randy recommends it as do I. If one is in doubt then take some table salt and RO/DI water to a pharmacist and have them make-up a 3.65 % solution. It is something I have often advised.

Randy's cal is a good idea but many are having big issues with it being off, as there is to much for error by the user, with teaspoons, coke bottles, etc. and what one "thinks" is correct.


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