Nikon 8370 Prostaff 550 Laser Rangefinder (Team Realtree) Measurement Range 11-550 yds Increment Reading .05/1 yds Magnification 6x Angular Field of View (Real) 6 Angular Field of View (Apparent) 34.9 Viewfinder Display meters/yards Eye Relief 18mm Diopter Adjustment +/-4 Power Source 1 CR2 Lithium Battery Size (Length x Width x Height) 5.1 x 1.5 x 2.7 in Weight w/o Batteries 6.3 oz Objective Diameter 21mm Exit Pupil 3.5mm Supplied Accessories CR2 lithium battery. True 550 yard ranging capability: For virtually any hunting situation. Tru-Target Ranging System Flexible ranging mode capabilities for various hunting conditions and terrain (see page 11 for Tru-Target details) Bright, multicoated 6x optics: Nikons legendary optics and proprietary anti-reflective coatings offer high-resolution images in most lighting conditions. Waterproof/Fogproof (except battery chamber): Guaranteed performance in virtually any conditions.