Teacher Inorganic and Organic Chemistry Molecular Model Set, 101-Piece Subject_Biology Plastic-bodied wave apparatus with eccentric

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

this metal wave helix demonstrates pulse propagation

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

Ratchet-stopped nickel-plated brass 25 mm micrometer screw gauge reading to 0

Teacher Inorganic and Organic Chemistry Molecular Model Set, 101-Piece Subject_Biology Plastic-bodied wave apparatus with eccentric101 piece teacher grade molecular model set with 51 atoms and 50 bonds covering carbon, hydrogen, oxygen, nitrogen, halogens, sulphur, and phosphorus for organic chemistry work.