If smaller means better, then Nikon's all-new ACULON Rangefinder is at the top of its class. With its ultra-compact size, this new rangefinder redefines "portability" and is small enough to fit inside almost any pocket. The ACULON Rangefinder delivers an accurate reading from six yards all the way out to 550 yards. Measurements are easy to read on Nikon's uncluttered, easy-to-view display. A simple, single-button operation makes it easy to get a quick measurement when needed. When the button is held down, the rangefinder gives a continuous measurement for up to 20 seconds as the user scrolls across the visible area. The ACULON Rangefinder has 6x magnification and a 20mm objective lens. It features long eye relief (16.7 mm) and is engineered using Nikon's multilayer coated optics for bright and clear images. The ACULON is programmed in Distant Target Priority Mode - meaning that it will display the range of the furthest target amongst a group of targets measured. This is particularly useful if the object being measured is partially obscured by grass or brush. It operates on one CR2 lithium battery and is water resistant and rainproof.