The self-calibrated Electronic Level Inclinometer displays angle and inclination simultaneously. Features ad working range of angle measurement 4 x 90deg . Audible tone confirms inclination position from 0 to 90deg . LCD rotates up to 180deg . Battery Type: AAA, Display Shows: (5) Units of measure, Battery Included: Yes, Length (in.): 9, Case Included: Yes, Display Type: LCD, Field of View: Rotates 180deg , Accuracy: ±1/8 in. at 50ft., Angle Reference: 4 x 90deg