[Walt Fricke]

Good indeed.

Rechecking, especially after doing something like running the engine a little, is one of the standard procedures if one hole is off. The suggestion is that a bit of carbon might have gotten on the seat, preventing full closure.

I've heard, on this very forum, that there is no standard calibration for these testers. Were I less lazy, I might take my low buck tester apart and measure the orfice, just to see.