The instrument should be handled with care, do not collide, and store in a cool dry place after use. Incredible chemical laboratory equipment aid tool, or as a decoration in your lab,making chemical experiment learning more efficient. Fully transparent design, good visibility and excellent presentation. Good for school teaching tool, learning display, and collectibles, also will be a great addition to your lab supplies. The transmission model uses a liquid as a working medium, and uses a liquid pressure to transmit power and control a transmission mode.