Nickel-Plated Brass Micrometer Screw Gauge, 0-25mm Subject_Chemistry and 500mm focal lengths for

and 500mm focal lengths for comparative refraction experiments

delivering wheel-driven power to a lamp or a Newton color disc

Two pith balls suspended on unspun silk from a brass pillar

Handmade wooden spice rack holds twelve 6-inch borosilicate glass test tubes with caps and includes a filling funnel for kitchen-to-lab cross-over gifting

the four-sided geometry letting students explore deviation through non-equilateral cross-sections

Nickel-Plated Brass Micrometer Screw Gauge, 0-25mm Subject_Chemistry and 500mm focal lengths forRatchet 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.