The Digital Stopwatch is an essential tool for scientists and researchers in various fields such as physics, biology, and chemistry. It provides precise and accurate time measurements for experiments involving events like oscillations, free falls, enzyme kinetics, and reactions. Its simplicity and accuracy make it a fundamental tool for conducting rigorous experiments. Time and calendar Pre-settable pacer Extremely durable Water and Shock Resistant LCD panel and lanyard It measures up to 24 hours Direction of the Keys: S1: to start, stop, adjust S2: to cycle, select S3: to display by segments, renew, setting S4: functional transformation Product Specifications: Product Code SE.GE4276-01 Size: 82. 5x 62.5 x 22.5mm Stopwatch: 1/100s Display Number Size: 4mmx12mm (w x h) Battery: AG13 × 1pc Chronograph: 1/100 split/lap time