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

the flywheel light enough to drive by breath for hands-on reciprocating-engine study

this Brownlee-pattern apparatus gives a clean visual proof of the 2:1 stoichiometry of water decomposition

75-inch height range for bench apparatus

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.