Universal Cork-Lined Clamp with Boss Head, 2.3" Capacity Material_Cork tightened with an Allen wrench

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

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

and a 1-degree protractor

Hand-driven Newton's color disc that spins seven painted segments fast enough to merge into apparent white through persistence-of-vision and additive color mixing

Universal Cork-Lined Clamp with Boss Head, 2.3" Capacity Material_Cork tightened with an Allen wrenchDie cast body with plated brass parts anchors this cork lined two prong universal clamp, gripping cylindrical items from 15 to 60 mm alongside an integrated boss head for retort rods.