3M Peltor H540A Optime III Band Ear Defenders

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Optime III - Effective protection and best comfort are the hallmarks of Optime III. Developed for use in extremely noisy environments, the protection is based on technology that minimises resonance in the holder casings. This results in maximum high frequency attenuation. Features • H520P3H to fit Centurion Helmets • Conforms to: EN352-3 • Weight 240g Samco Order Code: 130037

 Sound Attenuation, H, M, L & SNR Values 

Frequency (Hz)	Mean	         Standard	   Assumed
                Attenuation(dB)  Deviation         Protection Value
125		17.4	         2.1	           15.3
250		24.7	         2.6	           22.1
500		34.7	         2.0	           32.7
1000		41.4	         2.1	           39.3
2000		39.3	         1.5	           37.8
4000		47.5	         4.5	           43.0
8000		42.6	         2.6	           40.0
H = 40, M = 32, L = 23, SNR = 35

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3M
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