Door viewers are most often used in conjunction with a solid or partially opaque door. They offer a method of viewing who is behind it while minimizing exposure to the outside.

Look for the installation requirements of the viewer you are considering. Common door measurements will be included, but you should measure your door beforehand for accuracy.

Door knockers feature a wide variety of materials, including brass, iron, copper, stainless steel, and nickel.

The best door viewer for you will depend on your specific needs and preferences. For instance, mechanical door viewers are ideal for doorways that don't have electricity. Conversely, digital door viewers provide a more advanced visual interface. Consider the features of each type to make an informed decision.