This professional digital stopwatch timer is designed for high-precision timing needs, combining waterproof performance, multi-functional timing, high brightness display and durable materials, suitable for sports events, industrial production, scientific experiments and daily training and other scenarios. Core Functions High precision timekeeping Time resolution: support 0.01 second precision, to meet the needs of professional competition. Timing mode: Single timing (LAP): record segment time. Segment timing (SPLIT): display total time and segment time at the same time. Totalised Timing (TT): can continuously add up the timing data of multiple segments. Memory function: Stores multiple sets of historical data for post-race analysis. Waterproof performance Protection level: IP67 (waterproof for 30 minutes at 1m water depth), adapt to rainy days, poolside and other wet environments. Sealing design: The keypad and the watch body are sealed with waterproof rubber ring to prevent water intrusion. Durable Material Case: High-strength ABS engineering plastics, impact and abrasion resistant. Screen: Scratch-resistant mineral glass, clearly readable under bright light. Buttons: made of silicone, waterproof and comfortable to touch. Additional Functions Countdown Timer: Supports 1 minute to 24 hours countdown, suitable for training programmes. Applicable Scenarios Sports: running, swimming, cycling and other events timing. Industrial production: production line beat timing, quality inspection. Scientific research experiment: physical experiment, chemical reaction timing. Daily training: fitness, yoga, cooking timing.