[steven12]

5.2 to 5.5 is a good ph for mashingI. But is this at mash temp of 150 or room temp.I use a ph meter and use it at room temp,I have read you have to  adjust ph by .3 ph from the mash temp.Does this mean if i have a reading of 5.7 at room temp my mash Ph is 5.4 at 150 degrees and correct. Or does this mean my mash Ph is  .3ph to high.This is very confusing since I heard this a couple of years ago.

[Alewyfe]

That is at room temp.  Repeat, desired mash pH of 5.3-5.5 is room temp. A reading taken at 150F will be .2 to .3 lower.

Always measure at room temp. Mash temps will damage the electrode in your meter.