vintage Bruel & Kjaer protractor SC 2361 

Bruel & Kjaer protractor SC 2361 protractor for determination of reverberation time from decay curves recorded on level recorder type 2305 or 2307.

more info at pag 31 on,                                                                         

http://www.cieri.net/Documenti/Misure%20audio/Bruel%20&%20Kjaer%20-%20Electro%20Acoustic%20Measurements%20(AN16-035).pdf

 (once opend search 2361 or  Ctrf + F and 2361)

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