DT-2234B Photo Tachometer Typical max. 300 mm/12 inches is a very useful product. The rotational speed of any gadget can be measured with this product. The wide measuring range and high resolution of the auto range digital tachometer are impressive. The accuracy of this product is ( 0.05 % + 1 digit). It will help you measure the operating speed of an engine in revolutions per minute. Four 1.5V AA batteries are used as a power source. It is also known as a revolution counter. It has a display type of 5 digits, 10 mm. This tachometer can store memory of max value, min value, and last value. It also indicates the angular speed of a rotating shaft.
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