This professional grade sound level meter is designed for all kinds of environmental sound measurement projects. It features a wide dynamic range from 30dB to 130dB, fast (125ms) or slow (1s) time weighting to get an ambient reading or a short noise. minimum, maximum and data hold values, and A C weightings to get the right response for the human ear. Other features include backlit display with date and time, data logger function, analogue AC/DC outputs for connection to a frequency analyser, and a USB port to connect to your PC for further analysis. Includes an Alarm function which can be set to Over and Under thresholds. Great for car audio installers, clubs and PA. Level Ranges: Low: 30dB~80dB Med: 50dB~100dB Hi: 80dB~130dB Auto: 30dB~130dB Analog Output: AC/DC outputs from earphone outlet AC=1Vrms ,DC=10mV/dB 30dB to 130dB MAX MIN measurements Over range display Under range display A C Weighting FAST (125ms) SLOW (1s) response Data logger IEC61672-1CLASS2 Standard 1.4dB Accuracy 32700 Memories 1/2 inch electret condenser microphone 2 times/sec Display Update Analogue Output USB Connectivity