Compact and portable device for measuring object speed and acceleration. Features high accuracy with a range of 1-999m/s, recording up to 160 data sets. Durable aluminum alloy casing protects against sunlight and airflow interference. Includes LCD backlight settings (constant/auto-off), auto-shutdown, and USB charging (1-hour charge for 10+ hours of use). Safety features: overshoot, overdischarge, and short-circuit protection. Mounting options: - Without baffle: fits pipes 20-31mm (use ties for smaller pipes) - With baffle: fits pipes 16-43mm (use ties for smaller pipes) Multilingual (English/Chinese) with 3-button control (power/confirm, up, down). Semi-reflective LCD ensures visibility in all lighting. Package includes: 1 speedometer, 1 USB cable, 1 baffle, 1 screwdriver, 1 silicone tube, 2 cable ties, 8 bracket columns. Note: Slight color variations may occur due to lighting. Measurement tolerance: ��1-3cm.