Extech 407750 Sound Level Meter with PC Interface features: Big backlit display, PC Interface & background sound absorber; High accuracy meets ANSI & IEC 651 Type 2 standards; Background noise absorber for machine noise measurements filters ambient noise; RS-232 interface for capturing data directly on a PC; Large display with backlighting and analog bargraph; Min/Max; Analog AC/DC outputs for connection to a recorder; Tripod mount ideal for field use.