For some time, engineers making noise measurements have required increasingly versatile equipment. The sound-level meter has been supplemented by accessories to meet this need, but it has frequently been a limiting factor in the over-all performance. To remedy this condition a new sound-level meter has been developed. It not only meets the standard specifications but also has the high fidelity range from 20 c to 20 kc necessary for utilization of modern microphones. The stabilized amplifier with wide dynamic range and separate output system supplies a signal suitable for frequency analyzers, high fidelity tape recorders, or level recorders. Miniaturization has led to a compact, light instrument. Many applications, however, can be handled by a simple noise meter and are economically feasible only if a low cost instrument is available. To meet this need a companion instrument, the sound-survey meter, has been developed, whose performance closely approximates that of standard sound-level meters but with simplified operating features. Its diminutive size and good characteristics make it ideal for many tests and survey measurements. With this low cost instrument available, more people will make acoustic measurements, which result should ultimately lead to more widespread understanding and better handling of acoustic problems.