Measures up to 250 feet when used with its electronic target. Uses both sound waves and an infrared beam. Measures up to 60 feet in single unit mode using ultrasound. Range may be longer or shorter depending on environmental factors. Accuracy is 99.5% + or - ¼". Measure indoors or outside. Ergonomic design makes it comfortable to use. Built-in calculator to add linear measurements and compute areas and volumes. Features intelligent software, improved accuracy, seven storage memories, easy-toread LCD display, measures from front or back of unit, power indicator light on target, auto shut off and durable protective carry pouch with belt loop. Requires two 9-volt batteries.