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Old 02/10/2018, 07:13 AM   #1
kac01
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Refractometer needing calibrated monthly

Can someone please explain why my two refractometers need calibrated every water change. I have two refractometers and they both get about .05 out of calibration every month. Thanks


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Old 02/10/2018, 07:25 AM   #2
DesertReefT4r
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Try some fresh calibration fluid and .05 is not much to worry about. 35 ppt +-1.0 is good imo.


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Old 02/10/2018, 07:58 AM   #3
Zalick
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Mine stays spot on. New one purchased a year ago and it hasn't fallen out of calibration yet. Not sure why yours does. I would think low quality?


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Old 02/10/2018, 08:20 AM   #4
reeftanker3295
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Mine both do the same exact thing, only realized after buying calibration fluid on a whim one day. In a week they read about .002-.005 sg low. One's off eBay and ones a red Sea, not very old. Just remember to calibrate every time you use it, takes 2 seconds.


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Old 02/10/2018, 09:52 AM   #5
jayball
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Red sea refractometers are known for needing calibration every time you use them. The one I purchased from BRS years ago gets checked often but I only need to turn the screw once a year or so. Be sure it is not getting banged around in a drawer or something like that, they are shock sensitive.


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Old 02/10/2018, 06:04 PM   #6
outssider
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Quote:
Originally Posted by jayball View Post
they are shock sensitive.
they are also temperature sensitive !!... that is, the temperature of the refractometer/room temperature. try calibrating it in a cold place (let the refractometer reach the cold room temperature) then calibrate it then take it to a warm place, let it set for a while and check the calibration....



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Old 02/10/2018, 06:11 PM   #7
DesertReefT4r
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Oh yeah temp changes the reading as well forgot about that. I would calibrate mine 2-3 times a year and never needed major adjustment.


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Old 02/11/2018, 01:46 AM   #8
bif24701
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I donít calibrate mine, I canít. Darn thing rusted and now itís impossible. All you need to do is check it with your saltwater cal fluid and match it to your water. Easy. Even better, just match the new water to the water from display tank. I verify my display is within range once a week by comparing it to my refractometer cal solution.

Always allow 1 min to pass after you place the sample on refractometer before taking a reading.


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Old 02/11/2018, 05:39 AM   #9
JoeyBagadonuts
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I used to have to calibrate mine often when I kept it in a cabinet in the garage. Now I keep it in the house in a stable temperature and it stays right on. I just check it occasionally.


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Old 02/11/2018, 06:18 AM   #10
kac01
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thanks


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Old 02/11/2018, 08:32 AM   #11
ca1ore
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If you meant on the SG scale, then that's a lot (1.025 versus 1.020?). Mine won't drift that much in a year. If you meant 0.05 on the ppt scale then never mind, no biggie.


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Old 02/13/2018, 11:13 AM   #12
kac01
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The SG scale moves that much on both refractometers.


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Old 02/13/2018, 12:27 PM   #13
mako61
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Mine says ATC on it, think it came from BRS. It drifts +-.001 on the SG scale the times I have checked it. no where near .005 SG.


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Old 02/13/2018, 04:18 PM   #14
Zalick
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Quote:
Originally Posted by kac01 View Post
The SG scale moves that much on both refractometers.
What brands are you using? I've been using the Vee Gee Scientific STX-3 for about 1.5yrs now and its still on the money. Its much better than my Sybon.


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Old 02/13/2018, 04:24 PM   #15
HBtank
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Quote:
Originally Posted by Zalick View Post
What brands are you using? I've been using the Vee Gee Scientific STX-3 for about 1.5yrs now and its still on the money. Its much better than my Sybon.
I have had the same experience with my $30 refrac, and have seen many with similar results on cheap "ATC refracs" when I have read these threads.

No joke, touched the screw barely 2x in 13 years; my 35 ppt reference solutions are always spot on!

I think the reality is that most refracs are very solid except the red sea one, which seems to be some weird torture device disguised as testing equipment.


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Old 02/13/2018, 04:51 PM   #16
bif24701
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This will help you guys understand why these things are happening.
http://reefkeeping.com/issues/2006-12/rhf/index.php




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