Amprobe SM-CAL1 [3052382] Sound Meter Calibrator with Two Output Levels of 94dB and 114dB. The Amprobe SM-CAL1 sound meter calibrator is a sound meter calibrator with output levels of 94dB and 114dB. The calibrator generates these fixed sound level signals for calibration of sound level meters. Amprobe SM-CAL1 calibrators fit ½" microphones and offers easy, one-handed operation. The calibrator conforms to ANSI S1.40 -1984 and IEC942 - 1988 Class 2 standards.