Features:1. High-precision portable outdoor ranging telescope.2. This rangefinder is a precision optical telescope when it is not powered on. Observe the object through the eyepiece. When the observation is blurred, you can adjust the diopter by rotating the eyepiece of the eyepiece to see the object clearly.3. The model and target size of the test distance of 5 meters to 2000 meters are determined by the nature and weather conditions.4. This rangefinder uses the safe 905 nanometers, and uses half of the time from launch to return to the target object multiplied by the speed of light to get the distance of the target object.5. The high-definition effect has a larger field of view, and the multi-layer coated glass lens improves the accuracy while increasing the observation effect. Notice:1. Please use a regular 3V battery or AAA battery depending on the model and install it correctly. A voltage exceeding the allowable error will damage the precision measurement components inside the instrument.2. Please do not observe the sun through the eyepieces. The focused sunlight may cause permanent damage to the eyes, and may also cause irreversible damage to the internal optical sensitive devices.3. Avoid putting the instrument below -20C or above 60C, which may cause damage to the instrument.4. If there is no operation within 20 seconds, the system will automatically shut down, please do not long press the power button.5. Do not observe through glass. Product model: NKProduct size: 96*34*67mmProduct weight: 140gDistance resolution: 0.1mAngle measurement range: 0-90 degreesAngle measurement accuracy: 0.3 degreesLens quality: multi-layer coatingOperating humidity: