This is laser and uses the reflection tape also it seemed to work real well threw all 3 speeds of the fan ...will test it on an engine tomorrowHow accurate is it? I have a non contact laser tachometer that uses reflective strips. I have tested it on various pieces of equipment, but bought it to set the idle and high rpm of my Vanguard mud motor. It has proven to be very accurate, but it is a pain to apply the small square reflective tape.
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