When making reflectance measurements, it is imperative to have valid references. Whiteports can provide the needed white reference both for measurements made on optical benches and for measurements made in the field. The high diffuse reflectance of the Whiteports is ideal for most reflectance work, as they are precise and robust.

Whiteports are references of 1.5 mm thick Optolon 2, processed onto anodized aluminum plate.The 80 mm by 100 mm (nominal three by four inches) surface has been made for convenience in the field. The size is ample for obtaining valid references of solar radiation. Whiteports are thin, enabling a Whiteport to be placed in front of a sample, usually without disturbing any setup. They are handy references for radiometry as well as for spectrometery measurements.

Optolon 2 is a high reflectance material developed by Optronic Laboratories. The Whiteports were designed by Ancal and are made for Ancal by Optronic Laboratories.