Model 310

Our 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	3150	4000	6300	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	3150	4000	6300	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	3150	4000	6300	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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