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Laboratory touchless tachometers measure centrifuges, pumps, rollers, shafts, gears, motors, and moving surfaces by locking on to self-adhesive tabs with a beam of light and tracking the number of revolutions. Contact tachometers measure in a similar manner, only with the rotating surface touching the tip or speed wheel of the device. Precision components ensure stable and reproducible results. The tachometers clear displays are easy to read with digital counters and low-battery indicators.