"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. Battery Type AAA, Range ft. 2-230, Battery Included Yes 4, Measures Length, area volume, min./max., continuous, indirect length, multi-surface area measurements, Accuracy 1/16 in., Functions qty. 7. 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"