What is a tachymeter?

an instrument designed to measure angles and distances
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device designed to measure the speed of vehicle movement
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device for measuring the acceleration of heart rate
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an instrument measuring the speed of rotation of the drive shaft in the engine
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A tachymeter or tacheometer is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target. The principles of action are similar to those of rangefinders.
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