Principle
The unit emits a laser beam that is invisible and safe to the eyes. Then it calculates distances by measuring the time it takes for the laser to travel from the rangefinder to the target and then back again.
 
General introduction
Accuracy
This rangefinder is accurate to within +/- 0.3 meters in most cases. The effective operating range is from a minimum of 3.5 meters to a maximum range of 600/800/1000/1200/1500 meters. Please note that the maximum operating range may vary due to the reflective properties of the viewing subject, the size of the viewing subject and the environmental conditions at the time of use. Highly reflective shiny surfaces allow for longer ranges than dull, less reflective surfaces. Larger subjects are easier to measure than small ones. Bright light conditions adversely affect the maximum range of the item. The angle to the viewing subject may also affect the range. Viewing objects at a steep angle will limit the operating range.
 
Specification

• Model No: LR-RF02
• Wave Length: 905 nanometer
• Display: LCD
• Resolution: 0.1
• Waterproof: Yes
• Nitrogen Filled: Yes
• Self-Adaption under Foggy Weather: Yes
• Unit Toggle between Meter and Yard: Yes
• Built-in Tripod Mount: Yes
• Battery (not included): CR2 3-Volt Lithium
• Operation Temperature: -20 to 50°C
• Operation Humidity: ≤80%
• Dimension(WxHxD): 100x65x33mm
• Net Weight: 118g
• Package: gift box, soft bag

Monocular Part:

• Specification: 6x24
• Magnification: 6X
• Clear Aperture: 24mm
• Focus: Eyepiece
• Material: ABS
• Prism Type: K9
• Prism Coating: Fully Coat
• Field of Angle: 6.5°
• Field of View: 114m / 1000m
• Exit Pupil: 4mm
• Eye Relief: 12mm
• Distance measurement effective operating range: 3.5~600M
• Accuracy: ±0.3M
• Angle measurement effective operating range: -90° to 90°
• Accuracy: ±0.3°
• Remark: Battery is available but the price don't include it.
• If you need the battery, the unit price adds 2.15 dollars.
• Basic Functions: Measuring Actual Distance/Horizontal Distance/Height/Degree of Elevation
• Optional Functions: Speed Measurement, Golf
• Usage: Measurement in Hunting, Golf, Climbing and so on