A description is given of a new instrument for measuring the lustre or gloss of a surface. Useful features of this instrument are: (1) that angles of incidence and reflection of the light can be varied over a wide range, thus allowing of very complete lustre curves being obtained; (2) the test sample need not be cut for measurement; (3) easy portability. Typical lustre curves are shown for a variety of surfaces and some of the results are briefly discussed. It is pointed out that the instrument can also be used as a spectrophotometer.