99 meters ultra-long distance: millimeter accuracy, 0.5%, supports continuous adjustment, more convenient and more powerful; more accurate. It is suitable for direct line measurement, arc measurement, arbitrary curve measurement, irregular surface measurement and cylindrical diameter measurement in daily life and work. Long battery life: Built-in 200mAh low internal resistance lithium polymer battery, after full charge, it can achieve a standby time of 200 days. Charge for 5 minutes and last for 2 hours. High-quality materials: This product is made of high-quality aluminum alloy, high-hardness plexiglass and ABS materials, resistant to compression, scratch resistance and impact resistance, it is more durable and has a longer service life. Slim body and easy to carry 10 groups of historical records: easy data query. Sound measurement and amplification; breathing light measurement and amplification; Unit switching (cm/inch) Wide range of application: It is suitable for straight line measurement, arc measurement, arbitrary curve measurement, concave and convex surface measurement, cylindrical diameter measurement in daily life and work. Description 1. Small size, convenient and practical. 2. Lightweight up to 35 grams, compact and portable 3.8 function, three buttons can be easily operated. 4.99 meters long distance measurement. 5. Lithium battery can be charged directly, standby for 200 days. Specification: Shell Material: Aluminum alloy + Silica gel Screen: 1.8 inch VA LCD Shell Technology: Fine polishing + Frosted sandblasting Screen Coverage: 4H super dura Dimensions: 53 x 15 mm (diameter * thickness) Net Weight: 35 g Individual Measuring Distance: Up to 9.99 m Cumulative Range: Up to 99.99 m Accuracy: 0.5%, Support continuous adjustment Backlight Time: 30-180 seconds Cycle: On/Off Battery: 200 mAh 0.74 Wh Charging Interface: Type C Package Includes: 1 x Electronic Ruler 1 x Type C Charging Cable