What type of meter is used to measure sound?

A dB meter, or decibel meter, is specifically designed to measure sound levels in decibels (dB), which is a logarithmic unit used to express the intensity of sound. This type of meter is essential in various fields, such as environmental monitoring, workplace safety, and audio engineering, where understanding sound levels is critical. A dB meter allows users to assess whether sound levels meet regulatory standards and to evaluate acoustic performance in different environments.

The other choices do not measure sound. A voltage meter is primarily focused on electrical measurements, particularly the voltage of circuits. A multimeter can measure a range of electrical properties including voltage, current, and resistance, but it is not specialized for sound measurement. A signal meter typically measures the quality and strength of signals in communication systems and is not intended for sound measurement either. This distinction makes the dB meter the correct choice for measuring sound levels.