Does anyone have a particular technique for taking a sample from a cooler mashtun for pH measurement? I'm a bit confused on after mixing grain/water, should a draw a sample from the bottom through the ball valve or should I take a sample from the top immediately after mixing? If I do determine that I need to adjust pH do I add my chemicals, mix, rest for a few minutes then take an additional sample for measurement? I'm concerned that the constant mixing and opening may drop my temp down a bit too much. Any ideas and techniques are greatly appreciated. Thanks in advance for the help.