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Old 01/15/2018, 01:04 PM   #1
Slammed01
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Which refractometer? Amazon

Looking to replace my hydrometer and been researching seawater/salinity refracs .

They all look the same with ATC and hardcases. I did notice a few have a different viewer, is this correct and which is easier to read?





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Old 01/15/2018, 01:15 PM   #2
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I have the 2nd one and it works great. Make sure to buy some calibrating solution.


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Old 01/15/2018, 01:28 PM   #3
Slammed01
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Quote:
Originally Posted by Str8linespeed View Post
I have the 2nd one and it works great. Make sure to buy some calibrating solution.


You have the aqueous labs? I heard also you can calibrate with rodi?


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Old 01/15/2018, 01:31 PM   #4
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You have the aqueous labs? I heard also you can calibrate with rodi?


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Yes, the Aqueous Labs.

I dont know about using RO/DI, but for the $7 bucks I know this is right on.

https://www.bulkreefsupply.com/aqua-...SABEgLR1fD_BwE


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Old 01/15/2018, 01:44 PM   #5
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Tagging along


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Old 01/15/2018, 01:50 PM   #6
Slammed01
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Quote:
Originally Posted by Str8linespeed View Post
Yes, the Aqueous Labs.



I dont know about using RO/DI, but for the $7 bucks I know this is right on.



https://www.bulkreefsupply.com/aqua-...SABEgLR1fD_BwE


Yea I have the brightwell aquatics calibration added to my cart now


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Old 01/15/2018, 03:13 PM   #7
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Get 1 that is scaled for the range of our tanks. That one shows 20C or 68F. The Red Sea is for 77F.


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Old 01/15/2018, 03:31 PM   #8
rdnyva
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BRS has one for $39.99, the ones on Amazon are half the price. Is there a difference?

I’ve had the same one for almost 15 years. No name brand on it but it still works and calibrates fine, but maybe it’s time for a new one.


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Old 01/15/2018, 05:22 PM   #9
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We don't have all that much data on refractometers. Many of them are made to order and relabeled, so even knowing which company actually manufactured it is tough. You could try either model.

There are problems with calibrating with RO/DI:

http://reefkeeping.com/issues/2006-12/rhf/index.php#11

I used the PinPoint conductivity solution when I was using a refractometer. Something around 35 PSU, 1.026 SG @ 25C, or 53 mS should be fine if the solution intended for a refractometer.


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Old 01/15/2018, 09:14 PM   #10
Slammed01
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Thanks! Prob wait til next check and get the BRS with solution.


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Old 01/16/2018, 09:41 AM   #11
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I swear the cheap refracts with ATC work too good, never need to re-calibrate my old, rusty, even fractured 30 dollar refrac, while you can spend 3x as much for constant headaches.


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Old 01/16/2018, 11:26 AM   #12
Rover88
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Quote:
Originally Posted by Slammed01 View Post
You have the aqueous labs? I heard also you can calibrate with rodi?


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I calibrate with RODI. I took a course as an instrumentation tech, even if I'm only in sales now

Calibrating with a solution that exactly matches what you are aiming for is by far the best possible method. This means you are 'correct' at your setpoint.

Calibrating with RODI means you are 'correct' at your 'zero' point (Or 1.000 S.G). This means that you know a point where you are bang on accurate. But depending on the linearity of the Refractometer, by the time you get up to 1.026 you might be off. You might not be.


I calibrate using RODI just because I don't have the cal fluid yet. If I calibrate with RODI, I know that at the very least my tank is /consistent/. I might not be 1.026, maybe I'm only 1.025. But I at least can confirm I'm still 1.025, and my water change water matches my tank.


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Old 01/17/2018, 01:44 PM   #13
orcafood
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I like to have my local fish stores and fellow reefers test the water of the fish or frags I buy, then take a note of the deviation. After a few different stores and fellow reefers my refractometer is nicely calibrated, who doesn't constantly buy frags? They will likely even test the water for you right there to be sure.

I definitely advise against calibrating with ro/di. No way to guess slope and/or offset error amounts.


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