Our newly designed sound level meter 32 and 323 are aiming for complying of newly released standard IEC61672. In this standard, it specified that the sound level meter should have dynamic range no less than 60dB in each measuring scale range and specific response on different standard tone burst test patterns. For datalogger applications, CENTER 323 has internal memory of 64,000 records for different sampling rate and these data can be downloaded throught built in USB interface.