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The Center 390 is an advanced sound level meter and fully complies with IEC61672-1. This meter has only one measuring range and has a full 100db range from 30db to 130db. No need to worry about which range to use like in the 3 or 4 range models and no need to worry about signal latency in auto range models.
This unit is also a data logger and it is equipped with manual storing capability which can store 99 sets of data and can be readout from unit or through the PC interface.