This instrument is a heat conduction demonstrator designed for middle school physics teaching to illustrate the difference in thermal conductivity among solid materials. How it works The heat storage block is heated and heat is conducted along a set of heatconduction rods that have the same thickness and the same length, arranged in a radiating pattern. The rods are made from different materials to enable a clear comparison of thermal conductivity. The large bars attached to the base are flipped to reveal the heat transfer process and the relative performance of different materials. Setup and operation Place the instrument on a flat, balanced desktop. Spread a light layer of butter on the concave area of each heatconducting rod. Insert a match into the concave area in an upright position. Heat the heat storage block with an alcohol lamp. After a short while, observe the sequential tipping or falling of the matches on each heatconducting rod and compare the results to assess material differences in thermal conductivity. Maintenance and care After the experiment, allow the heatconducting rods to cool completely. Wipe the rods clean, apply a light coat of oil, and store the instrument properly. Take care not to drop the instrument or strike the heatconducting rods during use or handling. Key benefits Visual, handson demonstration of how different solid materials conduct heat, using identical rod geometry for fair comparison. Simple classroom setup compatible with common teaching activities and an alcohol lamp as a heat source. Reusable design that supports multiple demonstrations and experiments with minimal setup. Clear, observable results that help students grasp the concept of thermal conductivity and material properties. Applications and use scenarios Inclass demonstrations to compare thermal conductivity among materials with the same dimensions, helping students understand conduction principles. Science fairs or group labs where students quantitatively or qualitatively compare heat transfer rates across different materials. Studentled lab exercises focusing on observing heat transfer along rods and linking results to material properties and conductivity differences.