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.
This SUPER Erector Construction set is one of the best you'll find anywhere!
This simple but amusing magnetic toy will keep you busy for hours!
Build over 60 projects with this deluxe version of the Snap Rover kit!
This microscope is so versatile you can even take it with you on a job site!
This illuminated orbiter is great for demonstrations in the astronomy classroom!
Perform awesome experiments using everyday materials found in any kitchen!