Hey, I know it's something different but I use a Milwaukee salinity checker and I just used distilled water to calibrate it, well the distilled water was in a container under a cabinet and the water felt cold, and then when I checked my tank water, it kept reading around 1.023, and I swear it was around 1.025. Could it be affected by temperature, but then whenever I use the distilled water that came with the unit, it reads 1.000, and when I use the calibration fluid that came with it, it reads 1.022, so I am kinda confused.