This 1.5M wooden Optical Bench offers a cost effective alternative to metal optical benches. It consists of a wooden baseboard measuring 1.6M x 140mm, with a 1.5m scale divided in mm, plus 6 sliding moulded bases (100mm x 50mm each) with index line, brass pillar and locking screw. The following accessories are included:. 1 x 12V, 24W S.B.C projection lamp with lead and 4mm plugs. 1 x white metal object screen, 75mm in diameter, with gauze. 1 x holder for lenses, 38mm diameter. 1 x white metal receiving screen, 100mm x 75mm, with a slot for squared paper screen on the reverse. 1 x object needle mounted in 6mm brass rod. 1 x Plane mirror in a metal frame, 100mm x 75mm. Each of the accessories is mounted on a 6mm brass rod which fits into the stands giving an optical height of 125mm above the base board. A power supply unit is required for the projection lamp (B8G85458 or similar). The projection lamp is available to purchase separately (B8H76580). Replacement bulb for projection lamp is also available as a spare (B8A56820).