The Extech SDL600 records data on an SD card in Excel format. High accuracy: ±1.4 dB complies with ANSI and IEC 61672-1 Type 2 standards. Measuring range: 30 to 130 dB. Automatic or manual measuring range selection. AC analog outputs for connection to analyzer or recorder. Large backlit LCD display. Stores 99 measured values manually and 20 million measured values on a 2 GB SD card. Data logger with date/time stamp stores measured values on an SD card in Excel format for easy transfer to a PC User-programmable sampling rate from 1 to 3600 seconds. Min/max, measured value memory and automatic switch-off.