Noun
transilluminator (plural transilluminators)
A device or instrument that projects light, ultraviolet radiation, etc. through a translucent sample for observation or photography
When stained with ethidium bromide, the gel is viewed with an ultraviolet (UV) transilluminator. Source: Internet
DNA stained with crystal violet can be viewed under natural light without the use of a UV transilluminator which is an advantage, however it may not produce a strong band. Source: Internet