This easy to use millisecond timer has a clear, 4-digit LED display. Three sockets provide START and STOP inputs which respond to any change in the state of the circuit, making triggering very simple and reliable. A single switch changes the timer from GATE 1 start and stop to GATE 1 start, GATE 2 stop. The timer has millisecond resolution for times up to 10 seconds and then the display auto-ranges for longer periods up to 9999s with corresponding reduced resolution. 5V DC power supply and instructions included.