Gang: Here's the setting... I mash in a 10-gallon cylindrical Gott/Rubbermaid cooler. I add lactic acid to my mash to neutralize the 138ppm of bicarb I have in my source water. I add it with a dropper and the amount usually corresponds to the SRM of the beer. I have a small metal bowl (like you would see at a restaurant with ketchup in it next to your fries) and I freeze it in a bowl of water so I can cool my mash sample quickly. I have a very reliable (and nice-to-use) Omega pH meter that has been a dream to work with (thanks Claudius Budde!). So I have everything in the cooler, stir, take the temp, wait a minute or two and then grab a sample, put it in the frozen bowl, wait until it's around 70° and check the pH. Question: Is there data that suggests that X amount of time should go by before a good pH measurement can be taken? I am making my Munich Dunkel this morning (I work at home, hooray) and all of that Carafa is in there and I just wonder how accurate the reading is based on the amount of time everything has been mixed together. Thoughts?