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.
Ever wonder how to survive in the wilderness? These cards can help!
This microscope is so versatile you can even take it with you on a job site!
Build a model green house and 9 other green energy-related devices with this great kit!
Get swept away by this fantastic robot kit that uses vibrations to move!
Build a robot that's an artist too!
Build 14 assorted solar robots, some of which can travel over water!