Introduce This Laser Rangefinder Telescope is able to measure the distance as by emitting invisible eye safe infrared energy pulses to the target and instantaneously calculates ranges by measuring the time it takes for each pulse to travel from the rangefinder to the target and back. Everyone know as rangefinder measure the distance should up to the reflectivity of the target and The maximum range distance is for the best guideboard in red color, Because the colorsurface finishsize and shape of the target will affect the reflectivity and the range.Apart from its high advanced technical property, The device is superior to the similar products on account of its compact, light and artistic design.Characterized in high property and environmental adjustment capacity, So it can be widely used for sports like golf, hunting, architecture survey and design, firefighting systems, Net program, and outdoor survey, etc. Please strictly observe the following guidelines so you can use the equipment properly and avoid potentially hazardous problems. Before using this product, please refer to the Safety Precautions and Operating Instructions sections of this manual. Four kinds laser range finder of Jcs-601Jcs602-1000Jcs602-600Jcs-501FEATURES:Accuracy: +/- 1mFast and easy to aim Water and dust resistant10 second result displayCompact and lightweightErgonomic bodyAutomatic shut-off after 10 seconds unattendedInvisible and eye-safe laser; FDA Class I/CEDefault to Last Use settingsDiopter adjustmentlet's enjoy everyday. for lanhai range finder sports.