Farmunion Handheld LCD Digital Laser Tachometer RPM Test Small Engine Motor Speed Gauge MCU Embedded, based on optoelectronic, semiconductor laser and other advanced technology, and non-contact RPM measurement. Wide range of the measurement and high-resolution. Automatic measuring and manual measuring selection. High and low power of laser alternative for far and near distance measurement and eye protection. Auto recording 50 sets of data and adjustable sampling interval time.