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.
Command robotic creations with this cool construction kit!
Build an electromagnet, an electrical catapult, a doorbell chime, a telegraph, and more with this kit!
Experience this sphere powered by the sun!
This genuine meteorite is great for the rock collector in your family!
Build a model green house and 9 other green energy-related devices with this great kit!
Have hours of fun with this colorful remote controlled flying saucer!