School Stopclock. A highly accurate quartz stopclock in robust ABS case with two large stop/start and reset/split buttons. Clear 15mm LCD. Capacity: 59hrs, 59min, 59secs with resolution of 1/100sec. for first hour and sec. thereafter. The unit can be used with remote switches/timing gates etc. via the 4mm sockets at the rear. Powered by x AA battery (supplied). Dimensions (L W H): 95 90 75mm. Supplied in pack of 10.