REVASRI 1000 Yards Golf Rangefinder - High-Accuracy Disc Golf Vertical Measurement with Flagpole Lock, Slope Compensation, Flag Lock Vibration Function and Convenient Zipper Bag Details Battery Description: Lithium-ion polymer Water Resistance Level: Non - Waterproof Objective Lens Diameter: 21mm(exclusive)–25mm（inclusive） Measure in Feet, Yards and Meters. Unit switching method: Press and hold both buttons at the top at the same time and hold for 3-5 seconds. You can see the unit switching through the eyepiece. Measuring distance: 5-1000Yard Precautions: 1. choose a distance greater than 5 meters to measure indoors when testing. Because its minimum measurement distance is 5 meters. 2. Do not measure through the glass. Because the glass will refract all the laser light and cause the measurement to have no value. 3. Rainy, foggy, dusty weather will block the laser and affect the farthest measuring distance.
