| BRAND | Bruel-Kjaer |
| Product | 4231 |
| Description | Class 1 acoustic calibrator - 94 dB |
| Internal code | IMP4043855 |
| Weight | 0.15 |
| Technical specification | <p>Class 1 acoustic calibrator - 94 dB/1 kHz and<br>114 dB/1 kHz - type-tested and calibratable<br>Dry batteries. Not IATA restricted as per SP A123<br></p> |
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