Or jackhammer, or chain saw loud. That’s what the Globe discovered at several of the T’s most infamously noisy sections, with help from a sound level meter that measured the decibel output of ...

Classroom demonstrations of noise instrumentation and hearing ... hearing protection usage, and using a sound level meter.

Younk showed us how she uses a phone app sound meter to measure the levels from one toy. “I push my button; I have my sound level meter here,” she explained. “That was up to 92 decibels.” ...