【High Precision and Stable Performance】With a resolution of up to 0.01 mm and a measurement accuracy of 0.1 mm, the reading fluctuates by less than 0.01 mm within 24 hours. Reliable data captures subtle structural changes in tunnel and mine deformation monitoring 【Dual Measurement Ranges Available】Offers 20-meter and 30-meter measurement ranges to meet diverse project needs. Stainless steel body withstands harsh field environments. Compact size (410×100×35 mm) and weight (0.9 kg) make it easy to carry in the field 【User-Friendly Digital Operation】This convergence meter is battery-powered (not included) for extended continuous use. A clear digital display avoids reading errors, enabling quick and accurate measurements even in dimly lit tunnel environments 【Adaptability to Harsh Working Environments】Operates stably in temperatures ranging from 0°C to 40°C and relative humidity up to 90%. Its robust and durable construction withstands daily wear and tear, making it suitable for underground mining and tunnel engineering 【Wide Range of Monitoring Applications】This tunnel and mine position distance displacement gauge is an ideal choice for detecting tunnel convergence, mine displacement, and foundation pit deformation. It is widely used in civil engineering, mining, and building structure safety inspection