... to USB Adapter * Function: Lp, Leq, Lmax, LN. * Parameters measured: Lp, Leq, Lmax, LN. * Measurement range: * Lp: 30~130dB (A), 35~130dB ... (C), 40~130dB (F) * Leq: 30-130dB (10s, 1m ... * Built-in battery condition indicator * Alarm: Electron, adjusable, 30-130dB set, LED and optional relay contact (NC) output* ...