What kind of a drop should I expect to see between mash and kettle pH?
Brewed a pilsner last night and my pH meter was going haywire. I recalibrated before mash-in, took a sample, cooled it - first reading 6.05 - huh??? recalibrated, took a reading of the same sample - 5.4 - okay! - rinsed and re-took just for good measure - 5.7??
Broke out the colorpHast strips - solid 5.3 (which really means about 5.5-5.6) - i'm okay with that.
Then in the kettle, I used my meter - 3 consecutive readings, rinsing in between - every time dead on at 5.41.
So I'm curious what the differential between mash and kettle pH is - trying to determine if I was just getting bad readings or is something else awry.