My new Extech 110 arrived in the mail a couple of days ago. I tried it for the first time today. I believe it is not working correctly.
For starters, the temperature is displaying about 6 F lower than my other two thermometers. I know the other thermometers are accurate. So that means the adjustment to the ph for the temperature is incorrect.
Secondly, if I take a ph reading of milk, the ph display keeps going up for over a minute and a half. it might keep changing for longer than that, but I got tired of waiting.
Thirdly, the meter says my cheese became less acidic (higher ph) as the make progressed. After adding culture and ripening for 90 minutes, then adding rennet letting it set for 40 minutes, cutting curds and healing for 15 minutes, it says the ph was .25 higher than when I started.
I am gong to try calling Extech and seeing if they will replace it.