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Mechanical Engineers Rocks. - A tachometer(revolution-counter, Tach ,rev-counter,RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the

✔Measures the rotational speed with a visible red light beam from a powerful LED ✔High intensity class II laser measures from 2.5 - 99,999 RPM ✔Extra

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