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Old 02-02-2012, 10:20 PM   #1
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Refractometer calibration

Can you use tap water or does it have to be distilled or ro water?
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Old 02-02-2012, 10:41 PM   #2
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Everything I've read says you need to calibrate to 35ppt, that using ro/di or distilled is not an accurate way to calibrate.
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Old 02-02-2012, 10:43 PM   #3
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Hmm that's what the instructions say . That's rather odd
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Old 02-03-2012, 07:44 PM   #4
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Quote:
Originally Posted by mfdrookie516 View Post
Everything I've read says you need to calibrate to 35ppt, that using ro/di or distilled is not an accurate way to calibrate.
That is the proper way to calibrate a refractometer.
A refractometer measure how water bends (refracts) light. Freshwater bends light differently than saltwater so if you calibrate only using freshwater you don't know for sure it will give an exact reading when using saltwater. It should be calibrated with a saltwater solution of a known salinity...which is what calibration fluid is.
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Old 02-03-2012, 07:47 PM   #5
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Are they all calibrated the same then? The instructions say to use distilled water and adjust the screw untill the blue area is at 1.00 . It's an auto temp adjusting from marine depot . Maybe this one works different?
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Old 02-03-2012, 07:54 PM   #6
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Nope. They are all the same.
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Old 02-03-2012, 07:55 PM   #7
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I don't get it then why do the instructions say to do that?
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Old 02-03-2012, 07:58 PM   #8
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Refractometer for reading salinity w/ Free Calibration fluid - English
Steps to calibrate your unit
  • 1) Using the dropper place a few drops of the solution on the glass and close the lid.
  • 2) Looking through the unit and turn the screw until the unit reads sg 1.026 (35ppt)
  • 3) Screw the cap back on your calibration solution for storage. It is important that the cap is on tight or water will evaporate ruin the solution.
*** Do not calibrate using RO/DI water as this will not give accurate readings***
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Old 02-03-2012, 08:00 PM   #9
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Ok im going to call marine depot and get to the bottom of this .
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Old 02-03-2012, 08:30 PM   #10
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Just got off the phone with marine depot. He said ro di or distilled water is how it's supposed to be done but he also said you can do it with calibration fluid but the difference will be minuscule .
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