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 plugs1 x white metal object screen, 75mm in diameter, with gauze1 x holder for lenses, 38mm diameter1 x white metal receiving screen, 100mm x 75mm, with a slot for squared paper screen on the reverse1 x object needle mounted in 6mm brass rod1 x Plane mirror in a metal frame, 100mm x 75mmEach 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 (PP00057620 or similar).The projection lamp is available to purchase separately (B8H76580).