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 and portable: 1.5cm thin body, surface diameter of 5.3cm, 30g light weight, convenient and 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 and longer service life. - High definition LCD screen: Show measurement results much clearer. - Ultra-low power Semiconductor microprocessor: more precise measurement and longer lifespan. - 99 meters ultra-long Ranging: millimeter level precision, more convenient and more precise. - 10 groups of historical records: convenient for querying data. - Ultra-long Endurance: With built-in 200mAh low internal resistance lithium polymer battery, once fully charged, it can achieve very long standby time up to 200 days. Charge for 5 minutes and last 2 hours. - Other functions: rapid sound measurement and breathing lamp measurement and switching units (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. Features: Material: Aluminum alloy glass + Black color Power supply: 200mAh lithium polymer battery Charging port: Type-C Standby time: About 200 days Display Screen: 1.8inch VA LCD display (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 continuously adjustable Backlight duration: 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