2-in-1 tachometer UT372D is a powerful, safe and reliable device for measuring revolutions per minute (RPM). It offers two measurement modes: contact measurement and non-contact (optical) measurement, can be used to measure RPM, frequency, count, surface speed and surface length. The device is equipped with Bluetooth app data transmission, allowing users to view or analyze data on their cell phones. It is convenient to use in various situations and is widely used in the motor, fan, paper, plastic, chemical fiber, washing machine, automobile, aircraft, ship and other manufacturing industries. Product features: