Wooden Frame Abacus, 4 U-Shaped Steel Wires Material_Muslin offering a spread of spring

offering a spread of spring constants for simultaneous comparison in oscillation and Hooke's-Law experiments

95A single-phase rheostat on a 300x56mm tube with cover-protected constantan winding and 4mm safety socket terminals

Autoclavable polypropylene test tube stand holding six 25-mm tubes with six drying pins on the back

or yeast cultures for metabolic rate experiments in biology labs

and a motor accessory

Wooden Frame Abacus, 4 U-Shaped Steel Wires Material_Muslin offering a spread of springWooden framed abacus with four U shaped steel wires holding 20 plastic beads each on a 13 by 7 inch base, the compact option in the abacus series for foundational arithmetic.