Q&A 1. What can the electronic ruler do? Electronic ruler = 9.9 meters steel tape + 99 meters rangefinder + tape + soft ruler ten compasses. You can use it to complete plane measurement, curved 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 ruler is a 200mAh battery with a Type-C charging interface, and it has a full battery life of 3000 meters. Using ultra-low power consumption, standby time is about 200 days. 3. Is it durable and drop resistant? The fuselage is 6063 aluminum alloy, which is resistant to compression and construction. The screen is made of high-hardness plexiglasses, which prevents daily scratches and scratches. The gear part is made of nylon with strong hit resistance and super wear resistance, which has a long life. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: 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 plexiglasses Size: D53*T15mm Net weight: 35g Single ranging: up to 9.99 meters Accumulated ranging: 99.99 meters maximum Accuracy: plus or minus 0.5%, support stepless adjustment Backlight time: 30-180 seconds Buzzer: on/off Battery: 200mAh, 0.74wh Charging port: T?pe-C 1 x Electronic Tape Measure 1 x USB cable