Comprising a wooden base board 1 m x 140 mm with a 1 m scale divided in millimetres plus six sliding bases 100 x 50mm each with engraved index line pillar and locking screw. The following accessories are: - 1 lamp house with a white 240v 15watts lamp, 1- white metal object screen 75mm diameter with gauze,1- holder for lenses 38mm diameter, 1- white metal receiving screen100 x 75mm with slot for squared paper screen on the reverse, 1-object needle mounted in 6mm rod, 1- plane mirror in a metal frame 10 x 75mm. each of the accessories is mounted on a 6mm rod which fits into the stands giving an optical height approximately 125mm above the baseboard.