Up to 10 practical functions such as straight line measurement, round measurement, arbitrary curve measurement, irregular surface measurement, cylindrical diameter measurement, accumulation and subtraction of 10 historical records, measurement prompt sound, measurement breathing light, unit switching, and more; easily meet various measurement needs. 99-meter ultra-long distance measurement with single measurement range from 0 to 99 meters (automatic accumulation). Measurement data features millimeter-level precision with automatic accumulation and subtraction, and 10 groups of historical records can be recalled at any time for convenience and practicality. Lightweight and portable design with 15mm thickness and 30g weight, approximately one-third the size and one-quarter the weight of a standard tape measure, making it easy to carry and use anytime. Equipped with a high-tech microprocessor featuring ultra-low power consumption for extended standby and battery life. Dimensions: 53mm diameter x 15mm thickness (2.09 x 0.59 inches). Electronic ruler combines functionality of a steel tape, rangefinder, tape measure, soft ruler, and compass for plane measurement, curved surface measurement, irregular surface measurement, and circumference or diameter measurement in daily use and work. Powered by a 200mAh battery with Type-C charging interface, offering a full charge range of up to 3000 meters. Ultra-low power consumption provides approximately 200 days of standby time. Durable and drop-resistant construction with 6063 aluminum alloy body resistant to compression and impact. Screen made of high-hardness plexiglass to resist daily scratches. Gear components made of high-strength nylon with excellent impact and wear resistance for long service life. Shell material: aluminum alloy and silicone Finish: fine polishing and matte sandblasting Screen: 1.8-inch VA LCD display (white characters on black background) Screen cover: 4H super hard plexiglass Dimensions: 53mm diameter x 15mm thickness Net weight: 35g Single measurement range: up to 9.99 meters Accumulated measurement range: up to 99.99 meters Accuracy: ±0.5%, supports stepless adjustment Backlight duration: 30 to 180 seconds Buzzer: on/off switch Battery: 200mAh, 0.74Wh Charging port: Type-C Package includes: 1 x Electronic Tape Measure 1 x USB Cable