Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Seven-junction copper-and-iron thermopile from four

Seven-junction copper-and-iron thermopile from four 130mm wires of each metal

Document analysis kit teaches forensic investigation through ink chromatography

bending measurably under heat as differential thermal expansion of the two bonded metals drives the visible curvature

Free-standing life-size male urinary tract model exposes kidneys

Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Seven-junction copper-and-iron thermopile from fourCast iron 500g mass carries a retractable hook for suspension from spring scales, pulleys, or beams, serving as a replacement piece for gravitational and force measurement setups.