PortafilterProcrastinator
The Kruve is consistent, use 10.00g for a sample, 400 Kruve in the bottom and the largest sieve you can find in the top (1100 to 1600?). I don’t know how easy these are to find nowadays. Shake for 2 min with occasional vertical & horizontal taps.
I wouldn’t bother with a non-lab sieve if you want to share findings, but if you use the same sieve at home you’ll get results you will understand (if no one else does). I use 7.00g in a 3″ 600 um sieve. I wouldn’t use a 400um sieve for filter.
Indeed, these are not things that you would use regularly, but the only way to compare grind settings for filter (vital info for any recipe, which almost no one provides) and can be very useful as a sanity check (I don’t see any other way to do it).
I don’t see any advantage either way in measuring with Kruve or ASTM/ISO. Kruve 400 is a bit more laborious to clean, but easier to mount 2 sieves to get an idea of spread. Probably more shared data on the Kruve than ASTM/ISO.
“Expensive” is just a viewpoint, things cost what they cost, I’m sure you own stuff I wouldn’t want to stretch to paying for, but when you need a certain tool, then you need that tool.