Extech SDL600-NIST Sound Level Meter with Datalogging stores data in Excel format on an SD card which can be easily transferred to a PC. Extech SDL600-NIST Sound Level Meter with Datalogging features both auto or manual ranging as well as a large backlit LCD display. This instrument stores 99 readings manually, as well as readings via 2G SD card. The SDL600-NIST provides Calibration Traceable to NIST.