Ceramic Ring Magnet, 1.375" OD x 0.75" ID, 5-Pack Lab Equipment_Power Supplies Pocket-sized 45mm aluminum compass with

Pocket-sized 45mm aluminum compass with a graduated dial

Reproduces Ewald von Kleist's 1745 charge-storage device with concentric metal cups around a plastic dielectric

Large frog dissection model with numbered structures reveals digestive

measuring period under different loads to isolate mass from weight

Low temperature gradient- can withstand high temperatures & thermal shocks

Ceramic Ring Magnet, 1.375" OD x 0.75" ID, 5-Pack Lab Equipment_Power Supplies Pocket-sized 45mm aluminum compass withFive ceramic ring magnets at 1. 375 inch outer, 0. 75 inch inner, and 0. 3125 inch thickness, sized to stack on a vertical rod for like pole repulsion levitation demonstrations.