This compact sound data logging meter measures sound levels in accordance with IEC61672 Class 2 specifications using A/C frequency weighting. It has peak hold, Max/Min record and auto power-off functions. Real time data logging with selectable sampling timing from 1 second to 3600 seconds via SD memory card (sold separately) which allows stored data to be easily downloaded to a PC spread-sheet. Or use the meter's USB and RS232 computer interface (PC data acquisition software, USB and RS232 cable sold separately). Includes: meter with sound sensor and batteries (order wind shield separately)