Pistonphone Type 4228 is designed to be used for sound level meter and microphone calibration, and is ideal for in-field calibration over a wide range of temperature, humidity and pressure while still maintaining high accuracy.
- Standards : IEC 942 (1998) Class 1
- Calibration pressure : 124
- Calibration frequencies : 251.2
- Calibration accuracy : ± 0.2
- Transducer : 1-inch, 1/2-inch,1/4-inch and 1/8-inch