The Amprobe SM-20-A Sound Meter has been designed to check compliance with safety regulations and perform acoustic analysis by safety engineers, health, industrial and safety offices as well as quality control. The SM-20-A offers a PC interface.

They use two different weighting filters required by the IEC651 and ANSI S1.4 Type 2 for audio filtering. The A weighting is for general noise sound level and the C weighting is for measuring sound level of acoustic material control in various environments (ie 94dB 1 kHz etc.)
<ul>
 	<li>Designed to meet the measurement requirements of safety engineers, health, industrial safety offices and quality control in various environments.</li>
 	<li>A and C weightings for checking compliance with safety regulations as well as acoustic analysis</li>
 	<li>Measuring ranges: A weighting 30~130dB, C weighting 35~130dB</li>
 	<li>Frequency range: 31.5Hz~8KHz</li>
 	<li>Display with 0.1dB steps on a 4 digit LCD</li>
 	<li>Slow (1 sec) and fast (125ms) response settings to check peak and average noise levels</li>
 	<li>Max/min recording</li>
 	<li>Internal memory, 14,000 records</li>
 	<li>Recording intervals from 1 second to 8 hours</li>
 	<li>PC computer download capabilities</li>
 	<li>Data hold to freeze reading on digital display</li>
 	<li>CE, designed to meet IEC651 type 2, ANSI S1.4 type 2</li>
</ul>