A set of 10 pH Buffer Powder packets. Includes 5 pH 4.00 packets and 5 pH 6.86 packets. These are used to calibrate pH meters, and can also be used to monitor pH levels in aquariums or swimming pools.
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
This SUPER Erector Construction set is one of the best you'll find anywhere!
Build your very own smart robot!
This superb chemistry set features 350 mind-boggling experiments!
The Star-Ball Magnetic Puzzle is the perfect creativity tool for innovators, artists, writers, students, and you!
Discover how solar cells make electricity with this awesome kit!