An instrument that measures temperature using electrical or electronic means rather than traditional mercury or liquid expansion.
From electro- + thermometer (from Greek therme, 'heat' + metron, 'measure'). Developed in the 20th century as electronic sensors improved.
Modern digital thermometers are electrothermometers—they use tiny electronic sensors called thermistors to measure heat far more precisely and instantly than old mercury thermometers, and they're what enable your phone's health apps.
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