Nickel-Plated Brass Micrometer Screw Gauge, 0-25mm StockedLY9121 Built from two counter-rotating foil-sectored

Built from two counter-rotating foil-sectored plates with a belt drive and a pair of Leyden-jar condensers

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

Six-piece 3-inch optical lens set combining three double-convex and three double-concave glass lenses at 200mm

Jumbo-sized for heavier apparatus

Nickel-Plated Brass Micrometer Screw Gauge, 0-25mm StockedLY9121 Built from two counter-rotating foil-sectoredRatchet stopped nickel plated brass 25 mm micrometer screw gauge reading to 0. 01 mm with 0. 003 mm accuracy at 10 mm, supplied in a storage case for student precision work.