By Sangamo Weston, Enfield, Middlesex. Aerial current thermocouple meter manufactured with a bakelite case approximately 6.2 x 9 x 3.7cm. Power output from the T1154 transmitter was indicated on the aerial current meter on the front panel of the unit (used only for the MF range) or an external aerial current meter like this which was installed installed between the T1154 HF aerial output connection and the aircraft ‘J’ switch aerial selector. Push buttons on the front marked 'In Circuit' and 'Shorted'. 1941 dated . Good condition. Stock code M24300.