I bought this to test compression on my pickup and 150cc scooter and it worked great. I don't have another to compare its results but I can vouch for its consistency. I tested both devices multiple times and got the same readings each time. I was also pleased with the variety of adapters and extensions that came with the kit. It seems like a good compromise between price and quality - I'm sure pricier models will be more accurate, but for the typical shade tree maker I think it's more than enough.
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