NTi Audio XL2 Sound Level Meter - Manual (Page 217)

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Specifications
Linear Measurement Range
acc. IEC61672 / ANSI S1.4
(typ. microphone sensitivity)
XL2 + M2230: 24 dB(A) - 138 dB
XL2 + M2211: 29 dB(A) - 144 dB XL2 + M4260: 35 dB(A) - 144 dB