SPER Scientific Timers Observational Rsch

SPER Scientific Stopwatch, Observational Research, 3-1/2 X 2-1/4 X 3/4 In, 10 Hours Range, 1/100 Second Resolution, Red, 2 Count Up And 1 Count Down Channel, 2.6 Oz Weight, With Battery, Earpiece, Shock Resistant, Hands Free Operation, Used For Captive And Field Research, Alarm Is Audible Through Headphone, Ideal For Multiple And Simultaneous Processes, Stopwatch Mode Shows Current Lap Time In Upper Display, Cumulative Total In Lower One, Memory Stores Last 8 Lap Times - SPER