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General-purpose liquid-in-glass thermometers feature black writing on clear tubes for easy reading, with some models having white backing for even easier reading. Easily gauge temperature in any setting at a glance with these clear glass thermometers. Different models use either environmentally friendly organic liquids or classic mercury. These glass thermometers are suitable for general lab use, school, and testing. Thermometers are functional for a wide range of temperatures from well below freezing to far above boiling.