12V DC Power Supply for Hoffman Voltameter, CE Certified Size_17.5 Inch Low-conductivity-reference iron rods at 300

Low-conductivity-reference iron rods at 300 by 3mm in a ten-pack

and Kirchhoff's-law combinations

Matte-black metal body 20mm in internal diameter and 22mm deep on a bench rod

pressure-vessel

Illustrates liquid-density changes with temperature using a weighted 75mm hollow copper sphere that floats in 15°C water and sinks as the water warms to 30°C

12V DC Power Supply for Hoffman Voltameter, CE Certified Size_17.5 Inch Low-conductivity-reference iron rods at 300CE certified 12V DC power supply designed specifically for driving Hoffman voltameters during electrolysis demonstrations that separate water into hydrogen and oxygen.