The capsule is in excellent condition.

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The measurement microphone capsule MK 221 is a ½”– microphone capsule out of the assortment of measurement capsules of the manufacturer VEB RFT Mikrofontechnik Gefell who has manufactured except studio microphones also condenser measurement microphones of the diameter 1″, ½” and ¼” for the frequency ranges 20 kHz, 40 kHz, and 100 kHz since 1962. Condenser measurement microphones are electro-mechanical transformers of highest quality concerning construction and choice of material. The measurement microphone capsules are used in investigation and development of most different ranges. Especially the ½” – microphone capsule MK 221 has supplanted the 1″ – microphone capsule MK 102 because of the high sensitivity of 50 mV/Pa in the technique of measuring devices in a wide rangs. The measurement microphone capsules of Mikrofontechnik Gefell have the advantage in comparison with measurement microphones of other manufacturers the perforated disk is insolating put in the protection cap for the protection of the membrane. In this way the perforated disk serves as gauging grid at the same time. The condenser measurement microphone capsule MK 221 has a capillary tube between the inside and outside of the capsule for the equalization of the static air pressure. This fact makes possible the use of a humidifier between capsule and microphone preamplifier. The measurement microphone capsule MK 221 uses the international usual thread 60 UNS. Thereby is ensured the compatibility with ½” – measurement microphones and calibration or measurement devices of other manufacturers. Sizable accessories exist for the condenser measurement microphone capsule MK 221 such as measuring capacitor, humidifier, nose cone, probe adaptor and acceleration adapter. Originally the measurement microphone capsule MK 221 with accessories was developed especially for the precision sound measurement devices of VEB RFT Meßelektronik Dresden and also produced in high number of items.