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Radio measuring device (also radio measuring device, FuMG or FuG for short, then spelled “radio measuring device”) was the designation used by the German Wehrmacht before and during the Second World War for radio equipment and devices used for the location of aircraft or ships, for the fire control of anti-aircraft and coastal artillery or for the guidance of their own fighter aircraft.

These can be divided into active radio measuring devices (in modern German radar devices) with transmitting and receiving part, later also referred to as radio measuring device (FuMO), short radio measuring device, as well as passive devices that only received and did not transmit signals. The latter were also called radio observation devices (FuMB), today they would be called radar warning devices. The first active radio measuring devices were initially also referred to as DeTe equipment or DeTe device (“decimeter telegraph”) for camouflage. The army test facility Peenemünde used some active devices, such as "Würzburg" and "Würzburg giant" for tracking in the test of the "V2" rockets (aggregate 4).

The official name of the active devices was FuSE (radio transmitting/receiving device). For the fire-guided radar systems of the coastal artillery and marine flak, which was operated by the Kriegsmarine, there was the name FuMO (radio-measurement-locating device, e.g. FuMO 214 “Seeriese”). The FuMG 62 "Würzburg" was initially also called FMG 39 (Flak measuring device, introduction 1939).

See also:

Land based active types
German radio meters in the Second World War:
FuMO 301/302 “Freya 39 G/40 G”, from GEMA (Berlin), the first devices on frequencies around 250 MHz (wavelength 1.2 m, ultrashort wave)
FuMG 80 “Freya”, (GEMA), at 120–130 MHz (2.5–2.3 m), improved for up to 200 km range
FuSE/FuMG 62 or FMG 39 “Würzburg” by Telefunken, 560 MHz (53.6 cm, decimetre wave), parabolic antenna (mirror) with a diameter of 3 m, most commonly used fire guide radar
FuMG 40 “Mainz”,
FuMG 40 L "Kurmark"
FuMG 43 “Leipnitz”, “Freiburg”,
FuMG 64/FuMG 41 T/FuMO 221 “Mannheim”, “Freiburg”, “Köthen”, by Telefunken
FuSE/FuMG 65 “Würzburg Giant” from Telefunken, 560 MHz, with 7,5 m parabolic mirror for longer range, fire guidance radar for heavy flak and hunter guidance for night hunting, whether or not as mobile devices (FuSE/FuMG 65 E) on railway wagons
FuMG 75 “Mannheim Riese”, carried out tracking of the V1 and V2, consisting of FuMG 64 “Mannheim” and FuMG 65 “Würzburg-Riese”
FuSE/FuMG 68 “Ansbach”, FuMO 216 at the Kriegsmarine, 560 MHz, with 4.5 m parabolic mirror for longer range, fire guide radar for the flak
FuMG 77 “Marbach V” (initially called “Rotterheim”), first German centimeter wave device (9 cm wavelength) for fixed use, consisting of transmitter and receiver of the aircraft on-board radar device FuG 240 “Berlin” in the 3-meter parabolic mirror of the “Mannheim” system
FuMG 76 "Marbach" (9 cm wavelength), larger and improved FuMG 77 "Marbach V" with rotating small dipole antenna inside the 4,