99 meters ultra long distance: millimeter precision, 0.5% accuracy, supports stepless adjustment, includes power amplifier for enhanced performance; provides more precise measurements. Suitable for straight 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, achieves standby time up to 200 days. Charges in 5 minutes for up to 2 hours of operation. High-quality materials: Made of high-quality aluminum alloy, high-hardness plexiglass, and ABS materials. Resistant to compression, scratches, and impacts. Durable with extended service life. Slim design, easy to carry. Wide range of applications: Suitable for straight line measurement, arc measurement, arbitrary curve measurement, concave surface measurement, convex surface measurement, and cylindrical diameter measurement.