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

the high-concentration AgNO3 reagent for halide-precipitation tests

Eight aluminum-shank tuning forks tuned to scientific pitch (C4 = 256Hz) and ranging from 5 9/16 to 7 1/8 inches

near-collimated for astronomical analogue and long-throw projection setups

Alternate-model 75mm double-convex glass lens at 300mm focal length

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.