Simmons Range Finders recalibrate every shot, giving you increasing accuracy. Simmons Yardage Master Range Finders display distance in feet, yards or meters. Simmons Laser Rangefinders are resistant to the elements, and have built in operation modes to ignore rain and close in objects like brush. Yardage Master Laser Rangefinders by Simmons are designed to be virtually silent while in operation, and is ultra-compact and lightweight. Rangefinders by Simmons use only one-third the battery power of most competing models which means that over time, Simmons Range Finders will pay for themselves in battery savings.