ETA hand2mind V-Shaped, Dual-Scale, Mercury-Free Thermometers for Indoor Science Use (Pack of 10) Everyone in the classroom can measure temperature with this bulk set of dual-scale thermometers Thermometers are metal-backed and dual-scaled Classroom-safe thermometers have a glass tube that is mercury-free Each thermometer has two scales ranging from -14 to 230-degrees Fahrenheit and -33 to 110-degrees Celsius Includes 10 thermometers, each measuring approximately 5-3/4"