![]() Some models allow measurements with two or even all three measuring principles. The rotational speed can be determined mechanically, optically or stroboscopically with the handheld tachometer. Measuring principles of the handheld tachometer Therefore, when selecting an instrument, it is essential to ensure that the measuring range covers all the required speeds. Not all handheld tachometers can completely cover these value ranges. The measuring range is usually limited by the design of the instrument to the following values:. ![]() One hertz corresponds to one revolution per second and 60 revolutions per minute. Occasionally, the rotational frequency is also indicated in hertz. ![]() RPM is the English abbreviation for "rounds per minute". Handheld tachometers for control measurements during maintenance and repair work usually measure the rotational speed in revolutions per minute. Measuring range of the handheld tachometer In order to find a suitable handheld tachometer for the intended application, the most important requirements for the device should be determined in advance. The offered models differ mainly by the measuring range, the measuring principle and the additional functions. Compact device models, which are held in the hand during the measurement, are called handheld tachometers in contrast to permanently installed models. With tachos for fast and metron for measuring device, the tachometer thus also stands in the original meaning for a speed measuring device. The term tachometer is borrowed from the Greek language.
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