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What is Gallium Thermometer?

Mercury-free Thermometer (which also can be called “Gallium Thermometer”) contain a material called Galinstan which is a eutectic alloy of Gallium,Indium, and Tin which melts below the freezing point of water. This makes it useful for normal thermometer use where a mercury thermometer may be undesirable due to mercury’s toxicity.

For measuring human temperatures, it works just the same as mercury.