Statistical tools: Galton board is a professional tool for analyzing the statistical distribution of molecular velocity and studying the model of random phenomena. It is used as a teaching tool to study the model of random phenomena, the law of statistical distribution and to explain the rate of motion of gas molecules. Demonstrate the statistical distribution: By rotating the Galton board, the steel ball bounces randomly, forming an approximate bell-shaped curve, which allows you to observe and analyze the velocity distribution. TEACHING GIFT: Its compact size makes the Galton Board an ideal addition to any desktop and a gift for physics enthusiasts. HOW TO USE: Turn the apparatus upside down, pour all the balls into the V-groove, insert the insert plate, then flip it over so that the V-groove is on the upper part of the apparatus, pull the insert plate to make the balls fall, the collisions with the peg arrays be randomly spread out, the pegs are equidistant left and right from each other, and each horizontal position of the upper level is located exactly in the middle of level's two pegs, when the balls come into contact with the peg arrays, the pegs are all in a 1\/2 probability of falling to to the left or to the right, and then hit layer of pegs, and so on, until they fall into the narrow slots in the bottom plate, thus obtaining a number of balls of the same size falling from the entrance, and as long as the number of balls is fairly large, it piles up in the bottom plate in a pattern that approximates a normal density function Colour:Photo Color Material:Acrylic Package Contents: 1x Galton Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.