i have heard the same thing about distilled water, that it can throw off your settings. that reminds me i need to calibrate mine again, its been a while.

Good to know, thanks. I will look at getting a bottle of calibration solution, now that I feel that I've thrown off my readings (distilled showed as 1.0 exactly, so I didn't bother adjusting the unit). At least I can keep my salinity stable :lol:

I had no idea distilled could throw a refractometer of by that much! Without the calibration solution I might as well just use my swing arm meter. I will definetly be getting the pinpoint calibration solution with the refractometer. Thanks for bring up this point.:idea: