School Stopclock Tm30A - Count Down/Count Up 
This bench timer with count-up and count-down modes is easy to use as a standard timer or can be automatically triggered by external devices for start/stop and reset using the 4mm jack sockets. Colour coded buttons and jack sockets make the timer extremely practical and convenient to use. ﾕ 30ppm quartz crystal with a fixed calibrated capacitor of 27pF for high accuracy timing ﾕ 15mm LCD display ﾕ Resolution: 1 second ﾕ Supplied with battery ﾕ Quick and easy press-button action for activation of Start, Stop and Reset ﾕ Stop, Start and Reset actuation buttons located on the top of the timer for faster reaction times ﾕ 4mm jack sockets for Start, Stop and Reset allow automatic triggering of timer by external devices ﾕ Slide switch to select modes ﾖ clock, count-up, timer (for count-down mode) ﾕ Count-down mode with sonic Alarm on expiry � Count-up mode until stopped � Memory for count-down times � Impact-resistant ABS case with non-slip rubber feet for stability on the bench � AAA Battery included. ATP.