Bill Weir still needs to upload a photo of this so you can check it out.
Engine cylinder compression tester, fits most cars, used to detect low compression and or cylinder head defects, also have a spark plug removal tool to go with it.
Quite simple to use ..instructions in box or on Youtube :-)
Bill Weir's Personal Story:
Used once on my old Triumph Spitfire, along with my saprk plug removal tool.
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