This electronic ruler combines the functionality of a steel tape, rangefinder, and compass, ideal for measuring straight lines, arcs, curves, irregular surfaces, and cylinder diameters in daily use and professional settings. Features: - Compact & Portable: Slim 1.5cm body, 5.3cm diameter, and lightweight at 30g, offering convenience and practicality. - Durable Construction: Made from high-quality 6063 aluminum alloy, high-hardness plexiglass, and ABS materials, providing resistance to compression, scratches, and impacts for enhanced durability and longevity. - Clear LCD Display: 1.8-inch VA LCD screen with white characters on a black background for easy reading. - Advanced Microprocessor: Equipped with an ultra-low power semiconductor chip for improved measurement accuracy and extended service life. - Long-Range Measurement: Supports single measurements up to 9.99 meters and cumulative measurements up to 99.99 meters with millimeter-level accuracy. - Measurement Accuracy: ±0.5% accuracy with stepless unit adjustment. - Memory Function: Stores up to 10 groups of historical data for quick recall. - Long Battery Life: Built-in 200mAh lithium polymer battery provides up to 200 days of standby time. A 5-minute charge supports up to 2 hours of use. - Charging: Type-C charging port for fast and convenient charging. - Additional Features: Includes measurement sound prompts, a breathing indicator light, and switchable units (cm/inch). Backlight duration adjustable between 30 to 180 seconds. - Wide Application: Suitable for various measurement tasks including straight lines, arcs, arbitrary curves, irregular surfaces, and cylinder diameters. 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 (white on black) Unit Options: cm / inch (switchable) Single Measurement Range: Up to 9.99 meters Cumulative Measurement Range: Up to 99.99 meters Accuracy: ±0.5% Backlight Duration: 30–180 seconds Product Size: Approx. 53 x 53 x 15mm (2.09 x 2.09 x 0.59in) Product 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