The unit used to measure the strength of a magnetic field. The prefix "nano" means one-billionth.
A unit of magnetism 10.0E-09 tesla, equivalent to a gamma (10.0E-05 gauss).
magnetic fields are measured in units called teslas. The Earth's magnetic field has a strength of about 0.5 tesla. A magnetometer can measure one billionth of a tesla, or one nanotesla;
A unit of magnetism equal to 10-9 tesla, equivalent to a gamma (10-5 gauss).