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A digital tachometer is a digital device that measures and indicates the speed of a rotating object. Provides quick, accurate contact and non-contact measurement of the speed and rotating speed on the object surface. A digital tachometer circuit comprises LCD or LED read out and a memory for storage. Wide measuring range, high resolution. The visible digital liquid crystal display and backlight display. Laser target. Working temperature: 0 to 50C (32F to 122F) Auto power off 15sec.