Resistance Substitution Box Biology_Health & Genetics 25-inch aluminum tuning fork features

25-inch aluminum tuning fork features a round stem that grips firmly without damping the vibration

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

restoring UV-C output in the compatible goggle sanitizer cabinet once the original lamp reaches end of service life

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

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

Resistance Substitution Box Biology_Health & Genetics 25-inch aluminum tuning fork featuresTwelve 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.