2.5.0 spase://IUGONET/Instrument/KMO-JMA/KAK/MagneticFieldSensor Variometers and Absolute Instruments 2013-02-15T00:00:00 Variometers: Triaxial high-sensitivity fluxgate magnetometer (X,Y and Z components) and Overhauser magnetometer (scalar field F) after Apr. 1993. Four optically pumped magnetometers (X, Y, Z and F) (1972 - 1993). Torsion magnetometers (H,D and Z) before 1995. Absolute Instruments: Magnetometer theodolite (search-coil type) (D and I) and Proton precession magnetometer after (F) Jan. 1976. Vector proton precession magnetometer (H, Z and F) (1964 - 1975) Standard magnetometer (D, I, H and Z) proposed by E.A. Johnson (1939) (1958 - 1975). Schmidt's magnetic theodolite (D and H) and Schmidt's earth-inductor (I) (1930 - 1957). Wild-Edelmann's declinometer (D and H) and Wild-Edelmann's earth-inductor (I) (1913 - 1947). spase://IUGONET/Person/Chosaka.KMO-JMA GeneralContact Magnetometer JMA magnetometer spase://IUGONET/Observatory/KMO-JMA/KAK