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These Celsius thermometers have a plastic backing with a recessed glass tube. Tube liquid filling is mercury free. The high range thermometers show only Celsius temperatures ranging from -30° to 120° in 1-degree increments. The thermometers are 7" long and about 1" wide and come as a pack of 10. Science education products incorporate applied math and science principles into classroom and homeschool-based projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology.