Answer:
Electronic
Step-by-step explanation:
Electronic thermometers have a digital screen that displays the temperature that you are trying to measure.
Disposable thermometers don't have a digital screen but are like a strip that measures.
Mercury-free thermometers are like the old mercury thermometers and they measure with a substance that moves up the scale with printed temperature markings.
Glass thermometers are just regular thermometers but still not electronic and digital panels require it to be electronic.