I thought I'd try calibrating my ATC digital ph meter with the gh standard 4.01 solution and I tried to see what the ph was in the distilled water and it's reading 4.39 and I know that isn't right. I've been putting ph down during the week and after I tried calibrating it showed it was off by alot. It showed my ph was low after the calibration So I had been putting ph up and now I noticed some of the tips are burning. Guess my question would be did anyone try this solution and since I don't have anything else to re-calibrate with right now any advice to try to get the meter close to what it should be until I get another ph calibration solution. Or did I screw up and needed to do a two point calibration? Thanks for any help!