Type 1 Sound Meter Meets IEC61672 and ANSI S1.4 frequency weighting and time weighting specifications for a class 1 sound meter. Covers 30 130 dB in both Manual and Auto ranging scales with 0.1 dB resolution and an accuracy of ±0.7 dB. Features a large LCD display, fast or slow time weightings, peak hold and AC output. A calibration adjustment allows the user to quickly calibrate the meter's internal electronics. Can also be acoustically calibrated, in compliance with OSHA, using Acoustical Calibrator 850016 or equivalent. CE Approved. Comes ready to use with a windscreen, calibration tool, instructions, and two 9V batteries, all contained in a hard shell carrying case. Dimensions: 10½" × 3½" × 1½" (267 × 89 × 38 mm) Weight: 16.1 (454 g).