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

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

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

the larger geometry pushing pole separation wide enough that field lines extend visibly beyond the magnet body for filing maps

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

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.