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The pathologist, Doctor Carter, used his electron microscope to examine samples taken from the hand of Eldrad. The Fourth Doctor judged by the change in the electron charge that the hand was absorbing radiation. (TV: The Hand of Fear)
The Eighth Doctor had at least two electron microscopes in his TARDIS, along with a holographic magnifier, dimensional revisualiser and an antique brass microscope. (PROSE: The Dying Days, The Janus Conjunction)