Optical lens assemblies are composed of a number of lenses mounted for a particular imaging function.

Interferometers measure distance in terms of wavelength and determine the wavelengths of light sources.

Spherical mirrors are curved so that reflected beams converge on a focal point.

UV and visible spectrometers measure the amount of ultraviolet (UV) and visible light transmitted or absorbed by a sample placed in the spectrometer.

Navigational field instruments and equipment includes products such as distance meters and range finders.

Navigational instruments and avionics include GPS devices, compasses, chronometers, radar units, and other instruments for orientation, relative position and absolute position (longitude / latitude).

Trade journals, books and technical publications focus on a specific field or industry segment with regard to engineering, science, or technology.