Extech sdl600 data logging sound level meter extech sdl600 the extech sdl600 data logging sound level meter records data on an sd card in microsoft excel reg format for easy transfer to a pc for analysis the user can manually store 99 readings or set the logger to automatically store up to 20m samples with date and time stamp at a user selected sample rate its high accuracy of plusmn 1 4db meets ansi and iec 61672 1 type 2 standards over a range of 30 to 130db with auto or manual ranging