Earplugs/earmuffs are primarily used for noise protection in industrial settings. Common types include foam earplugs, silicone earplugs, and over-ear noise-canceling earmuffs. Foam earplugs typically offer a noise reduction ratio (NRR) of 25-33 dB, suitable for mid-to-high frequency noise; silicone earplugs are reusable and waterproof; over-ear earmuffs can achieve an NRR of over 30 dB, suitable for extended wear. For precision environments such as laboratories, it is recommended to choose professional noise-canceling earmuffs with a low-pressure design to avoid discomfort.