Regnault's Hypsometer prop65 the 90-45-45-degree faces redirecting wider

the 90-45-45-degree faces redirecting wider beams for total internal reflection and image-inversion work

One-meter wooden lever graduated in centimeters on a knife-edge fulcrum base

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

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

Two-gate photogate system with gate

Regnault's Hypsometer prop65 the 90-45-45-degree faces redirecting widerDouble walled copper cylinder hypsometer at 34 by 6cm on a steam boiler, with thermometer tubulure and glass manometer for calibrating thermometer upper fixed points under steam.