Salinity

[J. Montgomery]

Originally posted by JMBoehling
Question> How far below 0.00 does your refractometer indicate when you test RO/DI now?

I'd guesstimate my refractometer to read 0.098 with RO/DI water (should be 1.000)

[JMBoehling]

That's pretty far below the line isn't it. It just freaked me out when I measured water and it was way under the 1.000 level after calibrating it.

Now I hope the Biologist and Chemist that tested NSW on the Reefs calibrated their refractometers correctly

Later,

Jim

[J. Montgomery]

Originally posted by JMBoehling
That's pretty far below the line isn't it. It just freaked me out when I measured water and it was way under the 1.000 level after calibrating it.

For my refractometer, thats just two dashes (each dash is 0.001) below the 1.000 mark. Not too far below the line. I don't think marine biologists are getting their refractometers from Marine Depot!

[LB]

I just checked mine with a 2liter and 1/4 cup + 1 teaspoon and it read 39ppt. Kind of crazy this hasn't come up before!!!

On the upside think of the thousands of dollars saved in salt

[icantremember]

I ran across your thread after searching for refractometer calibration. I made up a batch of the DIY test solution per Randy's guidelines, calibrated, checked RO/DI water and checked my tank. 1.020!! I was way off using my RO/DI as a calibration point before. Thanks for the heads up on this topic. A big thank you to Randy as well!