| B-112||We can observe tracks of natural radioactive rays in about 5 minutes from a cooling start. 441 pins (patent pending) in the backside of the observation chamber base stick into dry ice and raise chilling effect. By "the alcohol removal that piled up in the base and alcohol supplement " once in one hour, we can observe about continuation 5 hours. Because of 288 super high brightness LEDs, we can observe clear tracks in the bright room. As the top surface is used heater glass, glass is not clouded and we can observe tracks clearly. Because heater glass is not fixed, we can easily set sources and magnets to the observation area. And it is possible to carry out various experiments (experiment of half life , or the Lorentz force law by the magnetic field with the beta beam) easily.There is a small hole to insert a source at the side of the chamber.