A system for measuring a glucose level in a blood sample includes a test strip and a meter. The power receiver is configured to control the resonance circuit to receive wireless power. A process of forming the electronic device can include forming a layer including silicon over the discontinuous storage elements. In one embodiment the retention mechanism comprises one or more holes in the anterior end of the plate. The first polysilicon layer is removed in such a way that a polysilicon cover remains on the oxide-filled trench, and the first silicon-oxide layer is removed.