1: This is a contact-type digital tachometer which is used in applications such as automobile maintenance, mechanical engineering, and maintenance of industrial equipment. 2: Function: MAX. Value, MIN. Value, Average Value, the Last Displayed Value, Low Battery Indication, Automatic Power off. 3: Highly accurate contact digital tachometer with high speed operation and instant readings from 0.5 to 19999RPM. 4: The LCD is backlit to allow making and reading measurements in low light conditions, automatic shutdown. 5: Multiple measurements, equipped with four types of rotating heads, suitable for different scene measurements, to make the measurement more worry-free and labor - saving. Widely used in motor, fan, washing machine, textile, automobile, airplane, ship, etc. Condition: Display:LCD Backlight Unit:RPM. Measuring Range:0.5-19999 Resolution rate:0.1(0.5-999.9), 1(1000-19999) Accuracy rate:0.05%+1 Sample interval:0.8s(60RPM or above) Power:2 x 1.5 AAA Battery (Not Included) Product Size:158x55x33mm/6.2x2.2x1.3in Function:MAX. Value, MIN. Value, Average Value, the Last Displayed Value, Low Battery Indication, Automatic Power off Color:Black Material:ABS Package Contents: 1 * Digital tachometer