etheric beam locator was a device frequently carried by the Doctor. It was presumably used to locate etheric beams, and was also useful for detecting ion-charged emissions.
When captured by
Kaleds on Skaro, the Fourth Doctor had an etheric beam locator in his pocket. ( TV: ) He also had it in Genesis of the Daleks London in 1889. ( TV: )
The Talons of Weng-Chiang
When faced with a bomb, the
Sixth Doctor searched his pockets for an etheric beam locator. ( AUDIO: )
The Doctor later searched for a type 7 enhancer for his etheric beam locator. (
The Raincloud Man
Hexen Bridge, the Seventh Doctor had a sub-etheric beam locator in his pocket. ( PROSE: )
The Hollow Men
Fortalice, Samantha Jones and Gila traded a dismantled and useless etheric beam locator for some bread. ( PROSE: )
The Scarlet Empress
Janus Prime, the Eighth Doctor had a sub-etheric beam locator in his pocket. ( PROSE: )
The Janus Conjunction
Tenth Doctor used one of these at one point whilst searching for an etheric energy emission. ( PROSE: )
Behind the scenes
The Master and his etheric beam locators. ( NOTVALID: ) The Curse of Fatal Death
The item that doubled as the Fourth Doctor's etheric beam locator in
Genesis of the Daleks and The Talons of Weng-Chiang was (in real life) a Varian Klystron VA220 valve used in microwave transmission and oscillator equipment, such as television transmissions and radar technology.
Comic Relief story had its version of The Curse of Fatal Death the Master outfitted with etheric beam locators, which were " Dalek bumps" placed in such a way that they appeared to give the Master "breasts".