BRUEL & KJAER 4230 Instructions And Applications

Portable Acoustic Calibrator
e
J
A simple to use pocket size acoustic calibra-
tor. Gives accurate sound pressure level of
94 dB at 1000 Hz.
BAUEL& K.'-'AC.A
N~RUM ,
DENMARK. Teleph. : 80 05 00. Cable : BRUKJA. Telex: 5316. COPENHAGEN
030 BB 0103