I also have one of those sitting in a box, it takes a little bit of practice getting used to it and getting the wire in resonance and learning to spot that moment. I find my $12 photo tach much more convenient to use though, but if I ever ran out of batteries or something I would have no problem using the sirometer.
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Originally Posted by jimbob200521
Now that is neat looking! Ever hook it up and use it?
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It doesn't "hook up" to anything! You just place it against the engine while it's running and turn the dial. As the dial turns the wire sticks out more and more at some point it will be in resonance with the frequency of the engine and will start to vibrate with a lot of amplitude. At that point you read the number on the dial and that's the RPM. Very neat device.