Features 1、OPTOELECTRONIC/CONTACT COMBO: The photoelectric/contact measurement accessories can be switched at will. 2、AUTOMATIC MEMORY: Digital tachometer can automatically memorize the maximum, minimum, and last measured values. 3、96 GROUPS OF STORAGE: Digital tachometer has up to 96 sets of measurement data storage capacity. 4、HD DISPLAY: Digital tachometer has large 5 digit LCD screen, high accuracy, smooth display effect. 5、ZERO ADJUSTMENT: Automatic zero adjustment, storage upper limit, minimum and maximum readings. Specification Item Type: Tachometer Material: ABS Model: DT6236C Purpose: Speed measurement of Tire Bearing Blades Battery: 1.5V 4 x AA Battery(Not Included) Basic Parameters: Measuring Range: Contact Tach 0.5 to 19999RPM Surface Speed (m/min): 0.05 to 1999.9m/min Surface Length (m): 0.05 to 99999m Resolution: Contact Tachometer: 0.1RPM (0.5 to 999.9RPM) 1 RPM (over 1000 RPM) Surface Speed: 0.01m/min (0.05 to 99.99m/min) 0.1 M/min (Above 100m/min) Surface Length: 0.02m (0.05 to 999999m) Measuring Range: 2.5 to 99999RPM Resolution: 0.1RPM (2.5 to 999.9RPM) 1RPM (Over 1000 RPM) Total Test Range: 1 to 99999 Package List 1 x Tachometer 4 x Speed ​​Accessories 2 x Speed ​​Reflector 2 x Screw 1 x Manual