RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands Polished beech wood test tube

Polished beech wood test tube rack with twelve vertical holes sized for tubes up to 28 mm diameter

Chrome-plated steel wire stand at 5 x 5 x 5 inches supports flasks and beakers above alcohol burners for classroom chemistry demonstrations

this metal wave apparatus pairs the rotary handle with a degree scale so students can read phase against vertical displacement

tightened with an Allen wrench for constructing lattice frameworks on laboratory benches

Speed-controlled 6V motor driving two cams pumps four spring-mass systems at any chosen frequency

RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands Polished beech wood test tubeThree primaries (red, blue, green) and three secondaries (cyan, magenta, yellow) sit in 50 x 50mm mounts, supporting both additive and subtractive color demonstrations in optical box setups.