Hearing protection
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NTR-3 Earmuff
The durable shell of earnyff is made out of high impact resistant ABS material. The extra soft ear cushions provide maximum seal, confort and complete hearing protection. It is suitable for wearing in the high noisy workplace.
Attenuation values
| Frequency（Hz） | Measured attenuation（dB） | Standard Deviation（dB） |
| 125 | 16.2 | 3.4 |
| 250 | 20.0 | 3.2 |
| 500 | 28.9 | 3.1 |
| 1000 | 36.5 | 2.8 |
| 2000 | 37.5 | 2.8 |
| 3150 | 39.7 | 2.3 |
| 4000 | 36.3 | 2.5 |
| 6300 | 36.1 | 3.3 |
| 8000 | 34.3 | 4.1 |
Tested according to ANSI S3.19-1974
Testing data above is provided by 
