• PicoTurbine: Kits for renewable energy education
• Sargent-Welch
  Suppliers of science-education materials, including test kits, etc.  
• Introductory water quality monitoring kit
  GREEN (Global Rivers Environmental Education Network)  
• Acorn Naturalists 

This list has been provided for your convenience. These products are not being recommended and this listing does not include every vendor or testing kit that may be available.