Lutron SL-4022 [SL-4022] Sound Level Meter

Lutron SL-4022 Sound Level Meter.  Frequency weighting and time weighting are meet IEC 61672 Class 1. Large LCD display, easy to read.  A & C weighting networks are conformity to standards. FAST & SLOW dynamic characteristic modes. AC output for system expansion.  Build in adj. VR, available for easy calibration. Condenser microphone for high accuracy & long-term stability.  Build max. hold reset switch. Max. Hold function for stored the maximum value on display. Warning indicator for over and under load.  LCD display for low power consumption & clear read-out even in bright ambient light condition. Used the durable, long-lasting components, including a strong, light weight ABS-plastic housing case. Compact and heavy duty housing case.  Low battery indicator.