Laser Measure, Jellas Digital Laser Distance Measurer 131ft/40m Mini Handheld Range Finder Meter. Portable Pocket-sized, More Convenient to Carry. Fast, easy, and accurate measuring, Measures up to 131-ft (40 m) and accurate to within 0.079 inch (2 mm) Calculated distance, area,volume.Indirect Measurement by Pythagorean Theorem . Large LCDwith backlight function,you can read data on display clearly in darkness. Includes: Jellas 40m Laser Measurer, 2 AAA Batteries and Manual