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Old 04-16-2012, 07:47 PM   #1
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refractometer help please..

I bought a refractometer yesterday and I received it today, and im trying to calibrate it. It says make sure the dark background matches the null line. What is the null line???
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Old 04-16-2012, 08:18 PM   #2
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I don't know what a null line is but u calibrate it where the bottom white meets the blue top. Or at least my brs refractometer has blue on top
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Old 04-16-2012, 09:44 PM   #3
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ok.. when I put R/O water on it the reading is zero. Dose that mean its calibrated?
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Old 04-16-2012, 09:49 PM   #4
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You don't want to calibrate it to zero. The reason is that you never use the 0 part of the scale. U need a quality calibration fluid.
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Old 04-16-2012, 10:25 PM   #5
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I ran into this as well when I got my refractometer. I talked to marine depot about it because the instructions say calibrate with ro or distilled water to zero. He told me the difference using calibration fluid or ro is very very little and not really something the average hobbyist needs to worry about.
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Old 04-16-2012, 10:28 PM   #6
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Hmm. BRS is very against it.
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Old 04-16-2012, 10:31 PM   #7
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They might be I'm not sure . Have you talked to them about it? I had my Lfs recheck mine with a digital refractometer after calibrating with ro and it wad spot on .
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Old 04-16-2012, 10:43 PM   #8
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I really dont know what mine is calibrated to. I got it in the mail today. Im assuming its calibrated as it reads zero with ro which it should. Im just not quite sure what to do. Did it come calibrated already?
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Old 04-16-2012, 10:51 PM   #9
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Mine didn't . Yours sounds like it may have but I cant be sure . I would just call the manufacturer and ask them. and let us know what they say if you do call .
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Old 04-16-2012, 11:02 PM   #10
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Ive emailed and will let you know what he says when he replies thanks for the help.
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