Hoffman Voltameter with Glass Stopcocks, Borosilicate Glass Neulog and lead plugs for pump-plate

and lead plugs for pump-plate connection during evacuation

accepting solar-cell input or battery power for energy-conversion student demonstrations

this five-meter retractable tape measure pairs a 13 mm curved rust-proof carbon-steel blade with a locking control

sized to read one step up from the 0-1A meter when student circuits draw past the lower meter's full-scale deflection

sized for the longer reach when students wire across a bench between power supply

Hoffman Voltameter with Glass Stopcocks, Borosilicate Glass Neulog and lead plugs for pump-plateBorosilicate glass Hoffman electrolysis apparatus with two 50mL graduated outer tubes, a 200mL central bulb, glass stopcocks, and both platinum and carbon electrode sets.