Common name: Microtech Gefell MK 390
Production Status: In production
The MK 390 is a selected pair of 1/4″ measuring microphone cartridges for sound intensity probes. The constructive design of the cartridge is equal to that of the MK 301. The equalisation of the static air pressure between the inside and outside of the cartridge is achieved by means of a capillary tube rear-vented into the preamplifier. The cartridge uses the international standard thread 60 UNS which ensures compatibility with a wide range of calibration equipment and measurement devices available from many manufacturers. includes wooden box.