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