你可以教正一下你的probe用教正液或以下
"HOMEMADE ORP CALIBRATION SOLUTION
Mix up a solution of 1 part bleach (Clorox brand is fine that you probably have in the laundry room) to 5 parts RO/DI water for a total of 6 parts solution. Make sure you have enough total solution to fill half a cup.
Put your now clean ORP probe in this solution and let it stand until the ORP reading stabilizes.
You should get a reading of 700mv from this solution. For our purposes this is fine to use instead of dealing with pH calibration solutions mixed with quinhydrine."