• High-precision measurement capabilities suitable for industrial noise monitoring • Real-time data recording stored to SD card (1-16 GB) • Automatic (30-130 dB) / Manual (30-80 dB, 80-130 dB) range selection • Measurement modes: SPL, Leq, with overload/underload indication • Frequency range: 31.5 Hz to 16 kHz • A/C frequency weighting and fast/slow time weighting options • LCD display with backlight • RS232 / USB interface and AC output (0.5 Vrms, 600 Ω) • Supports external calibration compatible with SC-942 or B&K 4226 • Power supply: 6 UM3/AA batteries or DC 9V adapter