Generally, the following factors should be taken into accountin the selection of typical endoscopes in one registration unit:For endoscopes with different view angles, the model with themaximum view angle should be selected.
For endoscopes with different field of view angles, the modelwith the maximum and minimum field of view angles should beselected.

For endoscopes with different inner diameter, outer diameterand working length, the model with the smallest diameter and thelargest slender ratio (length divide diameter) should be selectedIf containing working channel, the diameter should be the outerdiameter of insert minus the inner diameter of working channel.For different optical performance (such as angular resolutionetc.), the model with the highest performance should be selected.