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..got if for $18 total. Anywho, last spring I rented one from autozone and it showed low compression on a couple cylinders. I checked again today with my new toy and found after doing each cylinder 3 times...from left to right...facing the engine from front of car... 130, 90, 140, 150. After putting some oil in the 90 reading cylinder and redoing the test I got 200!! Looks like I'll have to do the Dalebwilson piston ring method sometime soon. She is still running good but with blowby in the air intake tube.