RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands holding under at least 100

holding under at least 100 Newtons of separation force after hand-evacuation of the air between them

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

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

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

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

RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands holding under at least 100Three 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.