The present invention is a toy projectile launcher in the form of a role play accessory such as a belt. The wrapper is made from pliable material, thin film or similar material and which can comprise a variety of package types and sizes of mail, media or other items. An electric potential is applied between the electrodes and a fill time of the sample into the device is calculated. A method of forming a field effect transistor includes providing a semiconductor-on-insulator substrate, said substrate comprising a layer of semiconductive material formed over a layer of insulative material.