https://www.mktester.com/relay-protection-tester/intelligent-digital-millisecond.html
The digital millisecond tape RS232 communication interface is widely used in electric power,, telecommunications, railway, transportation and electromechanical, mechanical and other departments. It is used to measure the electromagnetic contact, remote device, and automatic device various action time, action intervals, machinery. The contacts, contacts, power switch main contacts, time, three phases, interval, tensile interval, tensilate, slightly separation, interval between closures, hierarchics, tensile gain machine B contact, and Active pulse lines such as various band switches, lock switches, limit switches, and universal conversion switches are (also available for sports), and measure the speed of the A point to the B point.