318 is a portable handheld class II (type 2) noise, sound level or sound pressure level (SPL) meter used for measuring sound in decibels (dB). The meter comes with a microphone windscreen and can be mounted on a tripod (tripod sold separately - see accessories). The device also features an analog AC / DC output (AC: 1 Vrms at full scale, DC: 10 mV DC / 1 db).