1.2-in-1 Tachometer: Combines contact and non-contact measurement modes. It is primarily used to measure revolutions per minute (RPM), frequency, surface speed and length in motors, fans, automobiles, paper making, and related equipment. 2. Measurement types: Can test rotational speed (RPM), reverse rotation (REV), frequency (Hz), surface speed (m/min; inch/min; ft/min; yard/min) and length (m, inch, ft ,code). 3. Display: Backlit LCD screen for readability in dim or dark environments. 4. Photoelectric measurement mode: Suitable for non-contact speed measurement of fans, wind wheels, turntables, rollers, and similar components. No contact, safe and reliable. Use scenarios - Workshop and maintenance: Quickly verify RPM and surface speed of motors and fans using either contact or non-contact mode, enabling fast troubleshooting and alignment without interrupting operation where needed. - Manufacturing and quality control: Monitor rotating components on production lines such as fans, wind wheels, turntables, and rollers. Use photoelectric (non-contact) mode to measure speed safely on moving parts and reduce wear on the device. - Automotive and paper making applications: Assess RPM, frequency and length of moving parts in vehicles or paper making equipment to ensure process parameters stay within specification and support consistent performance.