anyone in the montgomery area have a refractometer

Actually, salinity measuring equipment should be calibrated with a calibration solution instead of RODI water. You can make your own calibration solution following the method described in this article by Dr. Randy Holmes-Farley.
 
thanks for all the info. i bought it at saltwater fant here in mont and they took it the back and said it was calibrated, not that i dont trust them, i just wanna make sure.
 
Tomoko is absolutely correct. In order to perfectly satisfied that the refractometer is reading 100 percent dead on when calibrated you would need the solution that RHF listed. Randy is probably one of the greatest chemists so far as reefing in (insert scope, world? not my place to name). When calibrating any instrument at work whether measuring flow, speed, weight etc we use a zero and span standard. This gives the measurement at the lowest end and the highest end of whatever instrument we are checking. It is also true that RO/DI water can be used as a zero check of the instrument in other words, 1.00 salinity? It's a quick check to see if the instrument is reading zero when it should be. It will not check to see if it's scewed on the upper end where we run our tanks. I guess I need to stop being lazy and make up a solution to check my r'meter at the upper end also :). It only has one adjustment, so reading correctly at span would be much preferred.

Thanks for the link Tomoko, as always, you are a wealth of information.
 
You are welcome. I believe that my refractometer is still calibrated, but my hand held TDS meter is giving me a different value from my inline dual TDS meter. I need to calibrate them. I wonder if there is any DIY calibration solution for it.
 
Thanks. I saw the postings, too, and wondered if AquaFina was still maintaining the level. I suppose it does not really hurt to try it :). I will probably order a bottle of calibration solution when I get more replacement prefilters.
 
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