... with the BTJ-8 irrespective of the Earth's magnetic field. The gyroscope axis oscillates around ... the gyro rotation,gravitational pull and the Earth's rotation. This enables a special electro-optical ... automaticStandard configurationtheodolite, gyroscope, tripod, battery boxes and a power supply cable.Accessoriesgyroscope battery charger, theodolite battery charger, operating manuals, drier, gear ...