Hello, I have been second guessing my PH test lately, after 10-15 seconds my ph reads 7.4 but when i let it sit for a minute or so while i do another test it drifts up to 7.8-8.0. Could someone please confirm when to read the test or is something wrong? I am testing with a tf-100 kit. Thanks Scott
18x34 ag, 14000 gal.