Resistance Substitution Box Biology_Health & Genetics Sixty-five-piece molecular model set with

Sixty-five-piece molecular model set with 32 atoms and 33 bonds for demonstrating bonding angles

2A rheostat with oxidized constantan winding on a 300x44mm vitreous-enameled tube

supplied dry so the user adds acid and charges it before running heavy-current electrolysis loads

Spring-loaded 4mm slit on a rod attachment opens and closes smoothly under finger pressure

Resistance Substitution Box Biology_Health & Genetics Sixty-five-piece molecular model set withTwelve position substitution box rotating through 100 ohms to 470k ohms at 1W and plus or minus 1%, dropping a known resistance into a circuit without rewiring during Ohm's law work.