1. Features This is a golf observation instrument that uses precision optics and digital technology to measure distance. It is a very safe distance testing device. It is safe without any form of energy radiation, and does not cause any damage or damage to the human body during distance measurement activities.< br>2. Two functions 1) .GREEN MODE (turf function) This feature is specially designed for golfers, you can easily get the distance between your holes. 2) .GENERAL MODE (general function) This function is suitable for ordinary situations. First, you input the height of the target, and then you can measure the distance between you and the target. 3. Part Name 1). Switch/adjustment key 2). Function keys 3).The battery is put into place 4). Peephole 5). Objective lens Main parameter indicators: Objective: 28mm; Eyepiece: 16mm; Resolution: 13; Magnification: 7x; The longest test distance: 930 yards (1 yard = 0.914 meters) Viewing angle: 7.8; Power supply: use two cr2032 button batteries (not included) Volume: 90mm50mm38mm; 4. How to use 1). Press the switch/adjustment key to start the instrument, and it will directly enter the lawn function. 2). When playing golf: The height of the ruler in yards (2.6 yards) is entered. (1) Align the bottom line of the screen with the horizontal line of the lawn. (2) Press the switch/adjustment key to adjust the position of the scan line up to the top of the golf flagpole. (3) The number will appear at the top of the screen, indicating the distance between you and the hole. 3). Used to measure the distance of special targets When the function key is pressed, the instrument enters the general function state, and the screen will display three digits and one decimal place. If you want to check (1) press the switch/adjustment key to input the general function status between you and the target, the screen will display three digits and one decimal place. (2) Press the function key to move to the ten digit, and then press the switch/adjustment key to input the number, the range is also 0 to 9. (3) Repeat the above steps to set each digit and one digit below the decimal point. (4) Press the function key to end the above input process. (5) According to the height you enter, the screen will display the minimum distance you can measure. (6) Align the bottom line of the screen with the bottom line of the target. (7) Press the switch/adjustment key to adjust the position of the scan line up to the top of the target. (8) A number will appear at the top of the screen, indicating the distance between you and the target. Please enter its height. 5. Precautions 1). The displayed distance is consistent with the entered height unit. 2). The power will automatically turn off after 60 seconds of operation. 3.) Attention! Please do not use this product to observe the sun with naked eyes, it will cause damage to the eyes. All Products From Us Have Undergone Strict Quality Checks. if There Is Any Quality Problem Or You Are Not Satisfied With The Product contact Us. we Will Give You The Best Solution.