Quote Originally Posted by fishcraze View Post
+1. I have to have two pH probes on the tank just to make sure the reading are accurate.
How do make sure that the two meters are reading accurately? Is it possible that they could both be wrong? The reason Im asking is because Im having trouble getting two meters to read the same. My Pinpoint consistantly reads .4 higher than the sms122. Both have been calibrated and both probes are less than a year old..