"The Bosch Laser Distance Measurer incorporates precision laser measuring technology, where the laser beam does both pointing and measuring, for distances up to 230 feet. Functions qty. 7, Measures Length, area volume, min./max., continuous, indirect length, multi-surface area measurements, Range ft. 2-230, Battery Included Yes 4, Battery Type AAA, Accuracy 1/16 in. Four measuring reference points back, front, swing-out extension pin for measuring from inside corners or channels, or center of optional tripod Multi-surface area mode calculates the total area of several individual surfaces with a common length or height Pocket-sized at only 4in. tall Min./max. measurement mode for accurate measurement to the shortest/ longest distance from a fixed reference point Indirect length measurement mode calculates inaccessible distances that cannot be measured directly due to obstruction or lack of reflecting surface Built-in bubble vial provides visual reference when measuring horizontal distances Four measurement systems inches, feet and inches, decimal feet and metric Length, area and volume measuring capability"