... 1kHz (sinusoidal) * Offers 4 measurement parameters Lp (sound level), Leq (equivalent continuous A sound), Lmax (maximum sound level), LN (percent of all readings over alarm ... range: * Lp: 30~130dB (A), 35~130dB (C), 40~130dB (F) * Leq: 30-130dB (10s, 1m, 5m, 10m, 15m, 30m, ... : 20.0 to 12, 500Hz * Frequency weighting: A, C and F (Flat) * Built-in calibration signals: 94dB at 1kHz (sinusoidal) * ...