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

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

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

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

Document analysis kit teaches forensic investigation through ink chromatography

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.