There are as many as 10 practical functions such as straight line measurement, circle measurement, arbitrary curve measurement, irregular surface measurement, cylinder diameter measurement, 10 historical records accumulation/subtraction, measurement prompt sound, measurement breathing light, unit switching; easy to meet Your various measurement needs. 99m ultra-long-distance measurement Single 0-99m practical distance measurement, up to 99 meters (automatic accumulation) ultra-long-distance measurement. Measurement data Automatic accumulation and subtraction of measurement data with millimeter-level precision, and 10 sets of historical records can be called at any time, which is convenient and practical. Lightweight and portable 15mm thick and 30g in weight. The volume is only 1/3 of the ordinary tape measure, and the weight is only 1/4 of the ordinary tape measure, which is convenient for you to carry and measure at any time. High-tech Microprocessor Ultra-low power consumption microprocessor is adopted to achieve super long standby and battery life. SizeD53*T15mm (2.09 X 0.59 INCH) Q&A 1. What can the electronic ruler do? Electronic ruler = 9.9m steel ruler + 99m range finder + tape measure + soft ruler and ten compasses. You can use it to complete plane measurement, surface measurement, irregular surface measurement, circumference diameter measurement, etc. in daily life and work. 2. How long is the battery life and is it expensive to use? The power supply of the electronic scale is 200mAh battery, Type-C charging interface, and the battery life is 3000 meters when fully charged. With ultra-low power consumption, the standby time is about 200 days. 3. Is it durable and drop-proof? The body is made of 6063 aluminum alloy, which is resistant to compression and construction. The screen is made of high-hardness plexiglass to resist daily scratches and scratches. The gear part is made of nylon material, which has strong impact resistance, super wear resistance and long service life. Description: Shell material: aluminum alloy + silica gel Shell process: fine polishing + matte sandblasting Screen: 1.8-inch VA LCD screen (white characters on black background) Screen cover: 4H ultra-hard plexiglass Size: D53*T15mm Net weight: 35g Single test: up to 9.99 meters Cumulative distance measurement: up to 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 data cable