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longer bulb life
Integrated MA852D/1 Amplified Probe:
you'll be glad you picked these pots
and stronger
2-Pt. Acoustical Calibrator - Class 2 vacuum pump longer bulb lifeFor calibration of all Sper Scientific digital sound meters or any sound level meter with 1 or microphone. Conforms to ANSI S1. 40 1984 and IEC942 1988 Class 2 standards for acoustical calibrators. Simply place the calibrator on to the digital sound meters microphone, turn on the calibrator, and adjust the decibel meters reading to either 94 or 114 dB. Operates at a frequency of 1KHz 4% and with an accuracy of 0. 5 dB. Built in battery check. Easily
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