calibrated refractometer

ReefMan1111 · 01/13/2009, 07:27 PM

how do I calibrated my refractometer I did not get instructions with it.

Jefe12234 · 01/13/2009, 07:39 PM

Buy a bottle of Pinpoint 53.0 mS salinity calibration fluid, put a few drops of it on the refractometer, then turn the adjusting screw until it reads 35ppt. I usually do this every time I do a water change since it's quite easy and it's almost impossible to use up an entire bottle of calibration fluid. You can also calibrate using pure freshwater, but it's not nearly as accurate at seawater levels. You should calibrate at the level you will be testing (35ppt in most cases).

01/13/2009, 07:27 PM	#1
ReefMan1111 Registered Member Join Date: Dec 2008 Location: milton vt Posts: 139	calibrated refractometer how do I calibrated my refractometer I did not get instructions with it.

01/13/2009, 07:39 PM	#2
Jefe12234 Registered Member Join Date: Apr 2001 Location: MN Posts: 885	Buy a bottle of Pinpoint 53.0 mS salinity calibration fluid, put a few drops of it on the refractometer, then turn the adjusting screw until it reads 35ppt. I usually do this every time I do a water change since it's quite easy and it's almost impossible to use up an entire bottle of calibration fluid. You can also calibrate using pure freshwater, but it's not nearly as accurate at seawater levels. You should calibrate at the level you will be testing (35ppt in most cases). __________________ Serenity now!!!