Designed to meet iec 61672 1 class 2 with accuracy of 14db a electret condenser microphone ensures accurate and repeatable readings auto ranging 30 to 130db manual ranges 30 to 80db 50 to 100db 80 to 130db selectable a or c frequency weightings fast or slow response filters 55mm lcd display with function indicators bargraph and backlight minmax data hold with peak max and peak min auto power off after 15 minutes of no activity can be user disabled standard 4mm camera bu