3M UltraFit 340-4002 corded earplugs, Reusable - NRR 27 (50 Pairs) Combination Smoke & Carbon Monoxide Detectors for indoor and low-light work

for indoor and low-light work choose a clear lens

For helmet slots use the cap-mount H9P3E sibling instead

See best acid-gas cartridge and best 3M multi-gas cartridge

for another value Class 3 sweatshirt hoodie

NIOSH-approved PAPR system (42 CFR 84) suited to non-IDLH

3M UltraFit 340-4002 corded earplugs, Reusable - NRR 27 (50 Pairs) Combination Smoke & Carbon Monoxide Detectors for indoor and low-light workEDITORIAL REVIEW: 4. 5 5 WC Safety Review 3M E A R UltraFit 340 4002 Corded Earplugs NRR 27 The 3M UltraFit 340 4002 corded earplugs covered on this page is reviewed here against its published specification and the standard that governs its category, not against a marketing claim. It is also listed as NRR 27 earplugs, reusable corded earplugs, 3M E A R UltraFit earplugs. Editorial assessment by Steven Eaton, WC Safety editor, based on published 3M