Hi all, I have the pool pilot digital DIG-220 and was wondering if I need to calibrate it. Last week it told me to add 25 lbs of salt. I went ahead and added 40 lbs because it would leave me well in the range. Anyway, when I test water with Taylor k-1766 salt test kit I get 2800. The dig 220 tells me 3100. My question is, does the pool pilot actually have a salt sensor or is it just going by the numbers the PB put in during installation? I know it's only 300 ppm difference but the temp display is off by 6 to 10 degrees on any given day. Does it have a temperature sensor or is it how it was calibrated at install.? I guess I'm just don't want to mess it up by calibrating it, but at the same time I want the info to be correct. Thanks for your input.