Laboratory Grade Copper (II) Carbonate Powder, 500g Chemistry Kits with identical volumes across specimens

with identical volumes across specimens for direct mass-density comparison

Pairs 50mm of aperture with a 150mm focal length on a double-concave glass lens at ~5

5% accuracy on a 60mm scale

Wooden-frame abacus with three U-shaped steel wires carrying 20 plastic beads each on a 13 by 6 inch base

Screw-operated laboratory scissor jack features a 6 x 5-inch steel platform with 55lb capacity and 2

Laboratory Grade Copper (II) Carbonate Powder, 500g Chemistry Kits with identical volumes across specimensUsed in thermal decomposition demonstrations producing copper oxide and CO2, this 500g bottle of laboratory grade copper (II) carbonate powder also serves as a green pigment in ceramic glazes.