3 Piece Pendulum Bob Set with Hooks (Brass, Copper, Iron), 25mm Health & Genetics_Health & Genetics Models For beam balance use and For beam balance use and chemistry mass measurement coursework Lead free five cylinder equal mass set at 30g each in zinc and iron bobs each with a removable threaded hook for mass and density comparison in pendulum period investigations
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3-Piece Pendulum Bob Set with Hooks (Brass, Copper, Iron), 25mm Health & Genetics_Health & Genetics Models For beam balance use and