Anyone with a Milwaukee MW102 or similar, have you experienced the following, which I have on the 4 or 5 mashes I've used this meter for(bought it in the spring):
I calibrate it with 7.01 and 4.01 solutions, Hanna brand (recommended to me by a Milwaukee tech on the phone) then test my sample at around 75F. The little hourglass shows on the screen for a minute or two, then disappears. I take my reading (in the case of an Oktoberfest this morning, 5.25.) However as I stand and watch the meter, the pH climbs to 5.49 over 2 or 3 minutes, then stabilizes.... but this increase from 5.25 to 5.49 was all with the hourglass off. What is my correct reading? Same thing happened with a Schwarzbier mash a few weeks back; the hourglass went off and the meter read 5.50, but it climbed up to 5.61 before it finally stabilized.
I know this is a bit nit-picky perhaps, because all the numbers are in a good range for the mash (this meter has ATC, but I always cool my samples into the 70s anyways) but I like to know what is going on. I called Milwaukee and the tech was frankly not very helpful. He said he thought the reading was valid when the hourglass went away, but also said some drift in readings is unavoidable. I am not stirring or shaking the sample, which he said is apparently a no-no, and I store the probe in Hanna storage solution all the time....
Any help from blatz, denny, or kai, or anyone else, would be appreciated....
thanks
Red