This electronic ruler is equivalent to 9.9m steel tape+99m rangefinder+compass, suitable for straight line measurement, arc measurement, arbitrary curve measurement, irregular surface measurement and cylinder diameter measurement in daily life and work. Features:- Compact & Portable: 1.5cm slim body, 5.3cm surface diameter, 30g light weight, convenient & practical. - Quality Materials: Made of high-quality 6063 aluminum alloy, high-hardness plexiglass and ABS materials, this product features compression resistance, scratch resistance and impact resistance, much more durable & longer service life. - High Definition LCD Screen: Display measuring results much clearer. - Ultra-low Power Semiconductor Microprocessor: More accurate measurement & longer service life. - 99 Meters Ultra-long Ranging: Millimeter level accuracy, more practical & more accurate. - 10 Groups of Historical Records: Convenient to query data. - Ultra-long Endurance: With the built-in 200mAh low internal resistance lithium polymer battery, once fully charged, it can achieve ultra long standby up to 200 days. Charge for 5 minutes and last 2 hours. - Other Functions: Measuring prompt sound & measuring breathing lamp & units switching(cm/inch). - Wide Application: Suitable for straight line measurement, arc measurement, arbitrary curve measurement, irregular surface measurement and cylinder diameter measurement in daily life and work. Specifications:Material: Aluminum Alloy + Glass; Color: Black; Power Supply: 200mAh lithium polymer battery; Charging Port: Type-C; Standby Time: About 200 days; Display Screen: 1.8inch VA LCD screen (white characters on black background); Unit: cm / inch (adjustable); Single Ranging: Up to 9.99 meters; Cumulative Ranging: Up to 99.99 meters; Accuracy: 0.5%, support stepless adjustment; Backlight Time: 30-180 seconds; Item Size: Approx. 53*53*15mm / 2.09*2.09*0.59in; Item Weight: Approx. 35g / 1.23oz; Package Size: Approx. 55*55*16mm / 2.17*2.17*0.63in; Package Weight: Approx. 50g / 1.76oz; Packing List:1 * Electronic Ruler; 1 * USB Charging Cable