Sight glasses are used to indicate the quantity of refrigerant in the liquid line of a system. They also display the moisture content in the refrigerant by means of a moisture indicator.
The cutaway models show commercially available elements from refrigeration technology such as compressors, valves, dryers and suction line receivers. The cuts are made in such a way that the design details are clearly visible.
The larger models are clearly mounted on a base plate. Two handles make them easier to transport.