Up to 10 practical functions include linear measurement, circular measurement, arbitrary curve measurement, irregular surface measurement, cylindrical diameter measurement, accumulation/subtraction of 10 historical records, measurement prompt sound, measurement breathing light, unit switching, etc.; easily cover your various measurement needs. 99m Ultra-long Distance Measurement allows for single distance measurements of up to 99 meters, with an automatic accumulation feature for ultra-long distance measurement. Measuring Data: Millimeter-level precision measurement data can be automatically accumulated and subtracted, with the ability to access 10 groups of historical records at any time for convenience and practicality. Lightweight & Portable: With a thickness of 15mm and weighing only 30g, it is just 1/3 the size of an ordinary tape measure and 1/4 the weight, making it easy to carry and measure anytime. High-tech Microprocessor: Utilizes an ultra-low power consumption microprocessor to achieve extended standby time and battery life. Size: D53*T15mm (2.09 X 0.59 INCH) Q&A 1. What can this electronic ruler do? This electronic ruler combines the functions of a 9.9 meters steel tape, a 99 meters rangefinder, a tape, a soft ruler, and ten compasses. It can be used for plane measurement, curved surface measurement, irregular surface measurement, and circumference diameter measurement in daily life and work. 2. How long is the battery life, and is it expensive to use? The power supply of the electronic ruler is a 200mAh battery with a Type-C charging interface, providing a full battery life for up to 3000 meters. With ultra-low power consumption, the standby time is approximately 200 days. 3. Is it durable and drop resistant? The body is constructed from 6063 aluminum alloy, providing resistance to compression and construction wear. The screen is made of high-hardness plexiglass, preventing daily scratches. The gear part is made from nylon, ensuring strong impact resistance and excellent wear resistance for a long lifespan. Shell material: aluminum alloy + silicone Shell technology: fine polishing + matte sandblasting Screen: 1.8 inch VA LCD screen (white characters on black background) Screen cover: 4H super hard plexiglass Size: D53*T15mm Net weight: 35g Single ranging: up to 9.99 meters Accumulated ranging: maximum of 99.99 meters Accuracy: plus or minus 0.5%, supports stepless adjustment Backlight time: 30-180 seconds Buzzer: on/off Battery: 200mAh, 0.74wh Charging port: Type-C 1 x Electronic Tape Measure 1 x USB cable