The SPC70 is a Class 2 sound level calibrator suitable for periodic testing of sound level meters and verifying their accuracy before and after readings, in accordance with international standards.
The SPC70 is simple to use and provides a 1kHz reference at 94dB and 114dB. By inserting the microphone of your sound level meter into the aperture of the calibrator, accuracy can be checked and adjusted before and after use.
The output is accurate to 0.5dB with low levels of harmonic distortion.
The SPC70 is compatible with the Martindale SP79 Class 2 Sound Level Meter and other meters with microphones up to 25mm.