2.5.0 spase://IUGONET/Instrument/KMO-JMA/MMB/ElectricFieldSensor Electric field sensor 2013-02-15T00:00:00 High-sensitivity electric field mill after Sep. 1975. Radioactive collector in combination with a noncontact electrostatic sensor before Sep. 1975. spase://IUGONET/Person/Chosaka.KMO-JMA GeneralContact Magnetometer JMA electrometer spase://IUGONET/Observatory/KMO-JMA/MMB