Two 38 mm spherical lenses; one is a double concave, the other a double convex, each with a focal length of 150mm. When placed together the net focal length is zero. (1-1/2" x 1-1/2" x 1/4"; .005Ib).
Great for optics experiments in the lab or classroom.
This classic device is used to demonstrate the conservation of mechanical energy.
Experience this sphere powered by the sun!
This adapter-powered butterfly uses Flexinor wires to create a realistic visual effect!
This black scorpion specimen is great for the classroom setting!
This kit includes several different projects that demonstrate the power of magnets!
Learn about hydrogen fuel cells with this incredible kit!
At xUmp.com you will find a large selection of scientific products carefully curated by real scientists and educators. We sell everything from educational toys, teacher supplies for science classroom, lab equipment, science toys, science fair supplies, classroom equipment, chemistry glassware, chemistry lab equipment, physics demos, electronics supplies, robots, science kits to geeky science gifts.