2-Pt. Acoustical Calibrator - Class 1 Sustainable Village finely ground particles drop into

finely ground particles drop into the storage chamber and can be easily emptied

pH adjusting crystals that will

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2-Pt. Acoustical Calibrator - Class 1 Sustainable Village finely ground particles drop intoFor calibration of all Sper Scientific digital sound meters and any sound meter with a " microphone. The 850012 Sound Level Calibrator is used to calibrate the sensitivity of the microphone and sound level measuring equipment. The design is based on the feedback method to ensure a highly stable sound pressure level. This compact and ergonomic sound calibrator conforms to ANSI S1. 40 1984 and IEC60942 (2003) Class 1 standard, and is perfect for