I tested Weyermann & Castle pilsner malt in distilled water and have the following results:
Weyermann Pilsner Malt = 5.80 (EZ Water uses 5.75 for pilsner malt, close enough). This is a pretty well known value.
Castle Pilsner Malt = 5.54
This difference is interesting and helps planning acid / alkalinity source for mashing.
The pH meter was a Hanna pHep5 with fresh 2-point calibration.