B & W Dip Meter
The B & W iHorn is made from a vintage Barker and Williamson Dip Meter. It was made in 1948. A Dip Meter was used in laboratories, ham radio shacks and/or radio/TV service shops. Its main function was to indicate resonant frequency of a tuned circuit. In addition, it was used to identify signal intensity. In short, the B & W made certain that you received the signal which you hoped to receive.
The B & W iHorn is a tool which during its day saved engineers and repairmen hundreds of diagnostic hours. While small and compact, it receives the signal and resonants in a way which remains relevant today.