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Digital Tachometers (DT*****-C) Description: What is Tachometer? Tachometers (also called a revolution-counter, rev-counter, or RPM gauge) is an instrument that measures the rotation speed of a shaft or disk, as in a motor or other machine, can be used in automobiles, trucks, tractors and aircraft. Tachometer (DT*****-A) Tachometer (DT*****-C) Tachometer (DT****6) Tachometer (DT****6) Tachometer (DT****7) Tachometer (DT****8) Thanks