you can do a proper wet / dry compression test.

do the dry one first, mark the findings down.
squirt some WD or light machine oil in the plug hole and do the wet compression test.
if the wet has better readings.... your rings are bad as the oil helps seal the ring gap.

Jim & Caroline
The highway is for gamblers, better use your good sense."
Gooday-that's my 1¢ answer due to the lousy economy ~ cause I ain't got - no . mo . doe
Every Shaver | Now Can Snore | Six More Minutes | Than Before ... | Half A Pound for Half a Dollar | Spread On Thin | Above the Collar || BURMA-SHAVE