The Standard specifies the characteristics of the following types of low-power.
magnifiers and gives recommendations for their selection for the inspection of surfaces.
- Single-element magnifiers of magnification typically up to x4 (Type A).
- Multi-element magnifiers of magnification typically up to x10 (Type B).
- Twin-system magnifiers of magnification typically up to x15 (Type C):
- Concave-mirror magnifiers with front-surface reflectors in powers typically up to ´6 (Type D).