Demonstration turntable is an intuitive tool for teaching probability, random events, etc. It consists of a rotatable disc, pointers, and partitions. The disc is proportionally divided into areas of different colors or marked with numbers and symbols. In teaching, rotate the dial to observe the area where the pointer stays, and intuitively understand the concept of probability. For example, if the red area accounts for 1/2, the probability of the pointer stopping in the red area is 1/2. Can be designed as a lottery game, or used for random questioning and grouping. Being able to concretize abstract probability knowledge, stimulate learning interest, and help students understand random phenomena is a practical tool for teaching subjects such as mathematics and science.