years ago i got a calumet shutter tester
i originally got it to test the speeds on my graflex slr ...
i eventually abandoned the task
and brought it to someone i know who has a shop
and we figured out all the speeds using his professional set up ...

this morning i tested some of the speeds on the slr with the calumet tester
it seemed to work OK ...

does anyone else have one of these gizmos ?
are they reliable ?