The UNI-T UT372 is a digital tachometer with USB connectivity.
The unit includes a built in laser pointer for aiming at a reflective target, and a tripod fitting to allow stable mounting.
The MCU transmits serial data to the CH9325 at 2400 baud. A packet is 27 bytes of ASCII data ending in CR, LF. The meaning of each part of the ASCII data is still to be decoded.