Bruel & Kjaer 4220 Highlights
- 20µPA Sound Level at 250Hz, Calibration accuracy ±0.15dB, Fits 1, 1/2, 1/4, and 1/8 inch microphones, Battery operated.
- 124 dB SPL at 250 Hz
- Satisfies IEC 942 (1988) Class 1L or Class 0L (with external barometer) and ANSI S1.40-1984
- High frequency and level stability
- Individually calibrated to within ± 0.12 dB (including effects of specified microphones)