Mastech MS6208A is a digital tachometer used to measure rotational speed with stable performance, high reliability and safety. It features a backlit LCD display for easy reading in low light conditions, and can measure speeds from 50 to 19999 RPM in various units (m/min, m/sec, ft/min, ft/sec, in/min). The device also includes data storage and reading functions, allowing users to store and recall up to 100 measurement values.