International standards 1000 Hz 94 dBSPL (1 Pa)Corrects the sensitivity of the microphone for the reference point ,Sound level is based on this point sound source corrector.

Output sound pressure level: 94dB of

Accuracy: ± 0.3decibel

frequency: 1000Hz Of the (sine wave)

power supply: AA Alkaline batteries, LR6 2 Gold

Battery Life: 35hour

Size: approx 110 (width) X 75.5 (high) X 46 (deep)

weight: 150g