A hand-held, mains electricity (AC-powered) device with a built-in light source, usually together with a lens, intended to be used to illuminate the skin and soft tissues, rendering them translucent for examination. It is typically used to examine subcutaneous and scrotal tissue/contents for lesions, and veins (e.g., on the scalp of an infant) for anatomical abnormalities. It can use varying forms of light depending upon the specific application. This device may also be known as a diaphanoscope, a phaneroscope or a light scanner.