Perfect-Prime SD080A, New Digital LCD Sound Level Meter Tester High Low Frequency 30dB ~ 130dB /IEC651 Frequency Weighting: A/C; Time Weighting: FAST (125ms), SLOW (1 sec) Precision: +/-1.5dB, Sine wave of 1KHz at 94dB Standard of IEC651, Resolution 0.1dB, Full-scale backlight (range: 30dB~130dB) Range: Low Freq band 60dB~100dB High freq band: 60dB~130dB