Quote:
Originally Posted by pinballdave
It appears to work fine, but it's definitely not a quality tool and I'd not expect it to be highly accurate.
It should be fine if all you want to do is check cylinders against each other to see if one gives a low compression reading, but if you want an accurate measurement to compare to the manufacturers specifications, then you might be better off with something a bit more trustworthy.
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That would be my expectation too - that the cheapo tools can be used as a comparator but probably are not helpful at getting an accurate reading.
I'm another Gunson user BTW - mine must date back to the mid 1980s but as it is only used very very occasionally (so maybe 20-30 times overall lol), and is stored carefully, I expect it to have retained most of its accuracy.