Digital Sound 8922, SPL Measuring Device, Hand device with Condenser-Microphone (spherical characteristic), Measuring range from 31.5 Hz to 8 kHz, Accuracy: +/- 1.5 dB, 6 Ranges in 10 dB-steps (30db up to 130db), A/C-weighting selectable, Max-Hold function, Display refresh (fast/slow), Can be calibrated, IEC 651 Type2 and ANSI S1.4 Type 2 measuring standards, uncertified, Large illuminated LC-Display, Including RS 232 interface, AC- and DC-Out, 9v DC, Including storage case and battery (9V, lasts approx. 20 h), Optional: Art. #237932# RS232 software CDR + PC cable, Optional: Art. #282263# USB PC cable and software CDR