Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy the high-concentration AgNO3 reagent for

the high-concentration AgNO3 reagent for halide-precipitation tests

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

Thirty-five-component electronics kit extending the Electronics System 1 set with capacitors

Converts chemical energy to electrical through a zinc-copper-sulfate redox couple

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

Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy the high-concentration AgNO3 reagent forCast 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.