The only way to really check compression is with a compression gauge---if you are a long term diesel "nut", as I am, a compression gauge is well worth the cost. Any other methods of checking compression, IMHO, is a "snake oil fix".
Ken
300D 1976 (3)
240D 1975 & 76
220D 1968-1973
200D 1966

__________________
K. Weimer
300SD (1)
300D (5) [Plus 1 parts]
300SEL 4.5 (2)
280SE (4)
280 (2)
250 (1)
250SE (1)
240D (7) [Plus 1 parts]
220D (11) [Plus 3 parts]
200D (2) [Plus 1 parts]
180c (with sunroof)

1995 Nissan UD1800 rollback
"If I can't fix it, it don't get fixed"