Bruel & Kjaer 4231 Acoustic Sound Source Calibrator 94 dB 1000 Hz IEC/ANSI

Bruel & Kjaer 4231 Acoustic Sound Source Calibrator 94 dB 1000 Hz IEC/ANSI. Used In Clean, Excellent Working Condition. The Bruel & Kjaer Type 4231 Acoustic Sound Calibrator is a precision device designed to provide a reliable reference sound pressure level for the calibration of microphones and sound level meters.

Known worldwide for its accuracy and durability, the 4231 is a trusted tool in acoustics laboratories, environmental testing, industrial safety, and field noise monitoring. Its robust design ensures consistent performance, while the portable size and leather case make it easy to use in both laboratory and field settings.

Output Sound Pressure Level: 94 dB SPL. IEC 942 (1988) Class 1. Power Supply: Standard 9V battery. Housing: Durable case with leather protective cover.

Calibration of sound level meters. Industrial safety and acoustics testing.

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