EEL Lightmaster Photometer serial no. 18-3486 (a light meter), three ranges, 10, 100 & 1000 lux (highest range faulty), complete with selenium photocell, connecting lead, and instruction leaflet, fixed into leather carrying case, manufactured by Evans Electroselenium Ltd., Halstead, and supplied by Diffusion Systems Ltd., 43 Rosebank Road, London, W.7., used at the National Museums and Galleries of Wales in the 1960s and early 1970s.