During a site survey, a sound pressure level (SPL) meter can be used for measuring

An SPL (Sound Pressure Level) meter is commonly used during a site survey to measure the ambient noise level in a room. This measurement provides a baseline for audio system design, ensuring that the sound reinforcement system can deliver adequate volume levels above the background noise.

CTS Technology Specialist Reference

According to CTS materials, assessing ambient noise levels with an SPL meter is a standard step in designing sound systems, especially in environments where speech intelligibility is critical.