A simple tool to use in setting governor for engine speed. No batteries. Very simple & every time I use it , it simply amazes me how it works! Just a little wire inside, hold it against engine, then when you rotate dial, the wire extends. When it gets to the point that the wire makes the widest swing pattern, that's the speed...just read corresponding numbers on the dial. You can test anything with a rotating shaft....electric motors too.
Any decent size mower shop should get it for you if they don't already carry in stock. Tecumseh Part #: 670156. Briggs Part #: 19200
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