I bought this to be able to check my new hanging clock and especially the RPM during break-in. I've been using it for a few months now. Easy to install and works right out of the gate. I can look over my shoulder at the engine RPM while running and see the total number of hours the engine has been off. I like that I can turn it off to save battery. Some just seem to stay on all the time. I haven't rated the accuracy as I have no way of testing it, but the indicated idle and maximum RPMs are close to what the engine manual lists as normal. Simple, cheap, works.
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