Optical Trackballs are using the latest solid-state optical trackball technology. They provide waterproof trackball solution and anti vandal trackball. They are designed for use in marine, industrial and medical applications. They provide different sizes of balls such as 25mm, 38mm and 75mm. It has adjustable friction control.
Optical wavelength meter is an electronic instrument that measures the wavelength of a light signal. It operates by measuring an interference signal between two light beams generated from the optical signal being measured.