These pull-type spring scales are required for, but sold separately from, several Flinn Scientific physical science and physics kits.
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Spring Scales, Pull-type, 250-g/2.5-N, Package of 6. Recommended or required for Coefficient of Friction—Advanced Inquiry Laboratory Kit (Catalog No. AP7725), Archimedes’ Principle and Buoyancy—Advanced Inquiry Laboratory Kit (Catalog No. AP7995), Force and Motion—Super Value Laboratory Kit (Catalog No. AP6929) and Simple Machines—Student Laboratory Kit (Catalog No. AP6931).