SM6236PLUS Photo/Contact 2-in-1 Digital Tachometer Product Overview This multifunctional photoelectric/contact tachometer features automatic storage of maximum, minimum, and last measured values, facilitating easy data collection and recording. The innovative speed-limiting accessories with grooves enable precise measurement of linear speed and length for wires, cables, ropes, and other linear objects. Key Features Microcomputer technology (MCU) with advanced anti-interferenc