Until youe inactive reserve obligation if fulfilled your not completely done with the military, your not in the military anymore either inactive reserves do not have IDs or access to post or the commessary. Your just a pool of civilians trained and ready to be involuntarily activated if we get into WWIII.
Electrical Technicians on the other hand, perform maintenance and repair on electronic devices. These devices include anything from a DVD player used to play movies to an MRI machine used by hospitals.
Instrumentation technicians have to work with three different kinds of equipment. The first set is the electro-pneumatic and pneumatic equipment. These devices include flow and temperature transmitters and devices that are started using diaphragms, bellows or pressure springs.