The base bench and the sliders are formed by aluminum pressed molding, slides can be sliding along the bench and also be locked, easy operation and durable.

Consist of below parts:

1, the base bench: silver-white color with oxidized processing, length of 1000mm with printing scales, division: 1mm

2, sliders: black color, length of 40mm with printing lines, 3 sliders in total

3, Light source: AC 220V/40W frosted bulb, mounted at one end of the base bench with connecting box and switch for on/off.

4, convex lens: Diameter 80mm, Focus length: 12cm. with plastic frame and metal rod for handling and also mounting on sliders.

5, concave lens: Diameter 80mm, Focus length: 12cm. with plastic frame and metal rod for handling and also mounting on sliders.

6, White screen with printing scales

7, Colorful image screen with hole, Colorful image screen with line gap