LIGHT MEASUREMENT APPARATUS

摘要

The invention provides light measurement apparatus comprising an elongate member (1), said elongate member having at one end thereof light-emitting means (6) and light-detecting means (7), at least the end of said elongate member provided with said light-emitting means (6) and said light-detecting means (7) being surrounded by a resiliently biassed sheath (8) whereby in use when said elongate member (1) is applied to a surface to take a reading said sheath (8) defines a light-tight enclosure.