Lutron SL 4112
SL 4112, Lutron All in 1 Meter Vane Anemometer, Humidity/ Temperature Meter, type K Thermometer, Light Meter, Sound Level Meter, RS232, data logger Basic Features * 30-130 dB, auto range, manual range. * Frequency and time weighting, IEC 61672 class 2. * A or C frequency weighting. * Fast/ Slow time