$\textit{Conductivity}$ is a scalar or tensor quantity the product of which by the electric field strength in a medium is equal to the electric current density.
For an isotropic medium the conductivity is a scalar quantity; for an anisotropic medium it is a tensor quantity.
$$\mathbf{J} = \sigma \mathbf{E}$$
Where $\mathbf{J}$ is electric current density, and $\mathbf{E}$ is electric field strength.
Applicable units are those of quantitykind:Conductivity
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=121-12-03
https://cdd.iec.ch/cdd/iec61987/iec61987.nsf/ListsOfUnitsAllVersions/0112-2---62720%23UAD025
"Conductivity" is a scalar or tensor quantity the product of which by the electric field strength in a medium is equal to the electric current density. For an isotropic medium the conductivity is a scalar quantity; for an anisotropic medium it is a tensor quantity.
$\mathbf{J} = \sigma \mathbf{E}$, where $\mathbf{J}$ is electric current density, and $\mathbf{E}$ is electric field strength.