Time counter, or rather + tachometer hour meter for gasoline generator

Link: ali.pub/p1g8r
There is a gasoline generator and for its technical services should be conducted according to certain operating time. Is ticking stopwatch or still somehow quite problematic. Therefore, it was purchased by the time counter, but rather a function of a tachometer with hour meter. Digital tachometer likely acts as a pulse counter to the spark plug. This tachometer is a replaceable battery, so a boat tachometer advise him not to use (can get water and oxidation innards start). But for gasoline generator, tiller, walking tractor, the tractor is fine.
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