YHJ-200J laser range finder to measure the distance (using a standard disc): 200m, within 30 meters Accuracy: ± 2mm *, resolution: 1mm Laser Type: 635nm, <1mW, laser spot diameter (in the distance): 6 / 30 / 60mm (10/50 / 100m), the total accumulated: 20 values, battery type: AA2 × 1.5V, protection class: IP 54, explosion-proof mark: Exib I, Dimensions: 148 × 64 × 36mm, weight: 0.2kg YHJ-200J laser rangefinder is a new generation of intelligent optical and electrical integration a laser rangefinder, ultra-low-power smart design, long working hours, the reaction speed, accurate measurement values, etc., built telescope *** menu navigation, data storage, laser automatically turns off, the instrument automatically shut down.