Pistonphone 4220 is a portable, battery operated instrument for calibrating sound level meters and measuring sets.
Sound level 124 dB compared to 20 uPa with individual calibration.
Accuracy +/-0.2dB.
Frequency 250 Hz +/-1% sinusoidal.
Sold alone or in a container with optional accessories.
First version:
Last version:
Used with microphones from 1" to 1/8".
Uses IEC R6 type batteries (AA)
