Compact 6" Galileo thermometer — a hands-on, decorative STEM toy and desk display that demonstrates thermal expansion and density. Housed in a sealed glass cylinder with colorful weighted bulbs and engraved metal temperature discs, it visually shows temperature changes as the bulbs rise and fall. Ideal for curious kids and learners who enjoy science experiments, classroom weather corners, or desktop curiosities — small, safe-to-observe, and perfect as an educational gift that sparks questions about physics and the history of scientific instruments.