RF Test Solutions partner Keysight Technologies offers range of materials and biological test solutions for determining how materials interact or respond when subjected to RF or electromagnetic fields. RF measurements include s parameters and transmission/return loss, reflection, phase, resonances etc. Electromagnetic measurements include permittivity and permeability. Solutions are based on Impedance Analysers or RF Vector Network Analysers with  probes or antenna and switching as required. Please contact us for more information and application notes on this topic.