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Old 01-01-2005, 04:37 PM   #1
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Refractometer suggestions..

I have seen the refracotmeters for $1000 or more. Thats great, but I am not spending that kind of cash. I have come across a couple that are (Ocean Tech) like betwenn 90 and 250 dollars. Anyone have a suggestion? The all have ATC and at least one is calibrated with distilled water which seems easy enough. I am looking for something easy to read, not some kind of goofy color scale..

Thanks,
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Old 01-01-2005, 04:43 PM   #2
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RH10 ATC, you can find them on ebay for about 40-50 bucks, it's a numeric scale, not color.
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Old 01-01-2005, 04:57 PM   #3
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I have one of the above and it's been working great for a year+
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Old 01-03-2005, 12:54 AM   #4
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Can you post the brand, not much on hits using rh10 atc..
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Old 01-03-2005, 07:24 AM   #5
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just use refractometer and then look for the rh10 atc. Almost all of them sold at the hobbyest level are rh10 atc, and different manufacturers put their name on it.
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Old 01-03-2005, 09:03 AM   #6
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I have been checking around and been getting concerned about them. I have seen refractometers with a varied accuracy. anything from +/- 0.2 to the best of +/- 0.001 . It seems that an accuracy of +/- 0.2 would not be acceptable for our purposes. Am I looking at this wrong or do we need to be careful about the units accuracy?
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Old 01-03-2005, 11:44 AM   #7
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if rh10 doesn't help, search for 'premium blue refractometer'...which is how I found mine.

As far as accuracy, I can tell you this model is more accurate than any swing arm hydrometer, and bulb/float type. People still use those and keep corals and fish, so I think my $45 refractometer is fine.
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Old 01-10-2005, 03:51 PM   #8
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Well I got mine in the mail today. Once again ebay came through for me. Total cost of $38. Model # RHS-10ATC. If you search that on ebay you will get several hits. I am very happy with it. Accuracy is +/- .001 so its not bad at all.HTH
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28gal bowfront
40lbs livesand(bag from LFS), 30lbs live rock(LR.com)
2 O. Clowns
1 peppermint shrimp, 5 red leg hermit crabs,
4 mexican turbo snails, 15 nassarius snails
ricordea mushroom, candy cane coral,
super color polyps, hairy mushrooms
bubble coral, hawiian feather duster
coralife lunar 2x65, HOT magnum canister
10 Gal refugium(chaeto) & seaclone skimmer
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Old 01-11-2005, 02:57 PM   #9
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So how do you test the accuracy? Just basing it on what the refractometer says is no more accurate than saying my hydrometer is accurate..Are you testing against a known? Just curious..
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Old 01-11-2005, 04:00 PM   #10
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They are much more accurate than the swing arm hydrometers, IMO. Where the swing arms lose their accuracy is in the buildup of sediment on the arm, or if bubbles stick to the arm during testing and temperature of the tester vs the water.

An ATC refractometer can be adjusted with either a known SG solution (sold as calibrating fluid) or most simply use known pure RO/DI water. This has an SG of 1. Using a liguid with a known SG you calibrate the refractomere and rarely need to recalibrate it. (at least I rarely need to recalibrate mine) Also, reading them is so much easier, there's no.. "ahh somewhere around .021 and .023. Reading a refractometer you know exactly where the line is.

JMO
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