Simply Aim! Shoot!! Measure!!! A special high accuracy, remote and difficult reaching points, and one person distance measuring device. Specifically designed for both indoor and outdoor applications. Shortcut keys for addition, subtraction, Pythagoras, area and volume calculation make measuring fast and very reliable. Under the strong light outside, it measures at least the specified range and under good light condition of indoor, it can achieve more than the specified range. 80Meters.