Octave band filters, Backed by our 15 Year "No Quibble" Warranty for your peace of mind, dB(A), dB(C) and dB(Z) Frequency Weightings included, Real-time 1:1 Octave Band Filters (optional), VoiceTagTM voice note recording, Measure up to 140dB(A) and 143dB(C) Peak with a single 120more...