This electronic ruler combines the functionality of a 9.9m steel tape, 99m rangefinder, and compass, ideal for straight line, arc, arbitrary curve, irregular surface, and cylinder diameter measurements in daily life and work. Features: - Compact & Portable: Slim 1.5cm body, 5.3cm surface diameter, lightweight at 30g, convenient and practical - Quality Materials: Constructed with high-quality 6063 aluminum alloy, high-hardness plexiglass, and ABS materials for resistance to compression, scratches, and impacts, ensuring durability and extended service life - High Definition LCD Screen: Clear display of measurement results - Ultra-low Power Semiconductor Microprocessor: Ensures accurate measurements and extended device lifespan - 99 Meters Ultra-long Ranging: Millimeter-level accuracy for precise and practical use - 10 Groups of Historical Records: Allows easy data recall - Ultra-long Endurance: Built-in 200mAh low internal resistance lithium polymer battery provides up to 200 days of standby time. 5-minute charge supports 2 hours of use - Additional Functions: Measurement prompt sound, measuring breathing lamp, unit switching (cm/inch) - Wide Application: Suitable for straight line, arc, arbitrary curve, irregular surface, and cylinder diameter measurements Specifications: Material: Aluminum Alloy + Glass Color: Black Power Supply: 200mAh lithium polymer battery Charging Port: Type-C Standby Time: Approximately 200 days Display Screen: 1.8-inch 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%, supports stepless adjustment Backlight Time: 30–180 seconds Item Size: Approx. 53 x 53 x 15mm (2.09 x 2.09 x 0.59in) Item Weight: Approx. 35g (1.23oz) Package Size: Approx. 55 x 55 x 16mm (2.17 x 2.17 x 0.63in) Package Weight: Approx. 50g (1.76oz) Packing List: 1 x Electronic Ruler 1 x USB Charging Cable