Model 310 The most versatile model
Can be adjusted to be worn over the head, behind the head, or under the chin. Excellent Attenuation High Quality Chrome Plated Hardware Low Profile Ear Cups - Color: Red Wide Foam Filled Ear Seals for Maximum Comfort Adjustable Headband for Optimum Fit NRR
24 dB | NOISE ATTENUATION DATA - MODEL 310 over-the-head |
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 |
| Attenuation (dB) | 13.8 | 20.0 | 25.9 | 34.0 | 38.9 | 41.1 | 40.6 | 38.1 | 35.0 |
| Standard Deviation | 2.7 | 1.7 | 2.1 | 1.3 | 1.6 | 1.9 | 1.0 | 1.5 | 1.2 |
NRR
20 dB | NOISE ATTENUATION DATA - MODEL 310 behind-the-head |
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 |
| Attenuation (dB) | 8.0 | 14.7 | 24.0 | 30.9 | 36.3 | 39.5 | 39.8 | 38.7 | 35.5 |
| Standard Deviation | 2.1 | 2.3 | 2.8 | 1.7 | 1.6 | 2.0 | 1.7 | 1.7 | 1.4 |
NRR
20 dB | NOISE ATTENUATION DATA - MODEL 310 under-the-chin |
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 3000 | 4000 | 6000 | 8000 |
| Attenuation (dB) | 8.6 | 15.5 | 23.9 | 32.4 | 36.9 | 38.7 | 38.9 | 37.8 | 34.8 |
| Standard Deviation | 2.3 | 2.2 | 2.1 | 1.6 | 1.9 | 1.8 | 1.5 | 2.3 | 1.5 |
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