Features a large bar graph display, A & C decibel frequency weighting scales, min/max, fast or slow response, AC or DC output, auto-power-off, low battery indicator. Meets ANSI S1.4 Type 2 and IEC 61672-1 Class 2. N.I.S.T. traceable certificate of calibration available or calibrate in compliance with OSHA anytime using optional Acoustical Calibrator 850016. Covers 30 ~ 130 dB in the A & C scales with a resolution of 0.1 dB and an accuracy of ±1.4 dB (ref 94 dB@1KHz). Comes ready to use with a windscreen, 9V battery, instructions, and a foam lined hard shell carrying case. Dimensions: 10¼" × 2¼" × 1" (258 × 55 × 25 mm)Weight: 6.5 oz (185 g).