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This heavyweight category features scales, mass sets, and fun toys that illustrate the properties of mass and density.
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Dynamic Density Kit

7 piece kit to teach volume and density

Economy Balance Scale

Durable double pan balance scale.

Groovy Motion Lamp

13" translucent groovy motion lamp

Mars Mud Ooze

Have gooey fun with this polymer ooze!
From $2.50

Mass Set

Set of 54 stackable plastic masses

Warblette Activity Kit

Warblettes and Lab Manual

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Microscopes starting at $79.95