4M Kidzlabs Lemon Powered Clock, Chemical Electrical Science Lab Experiment - STEM Toys Educational Gift for Kids & Teens, Girls & Boys

4M Kidzlabs Lemon Powered Clock, Chemical Electrical Science Lab Experiment - STEM Toys Educational Gift for Kids & Teens, Girls & Boys 12 Count (Pack of 1)

4M Potato Clock DIY Green Science Chemistry Engineering Lab - STEM Toys Educational Gift for Kids & Teens, Girls & Boys, Brown

EUDAX Fruit Battery Science Experiment Kit with Electronic Clock and RGB LED for DIY Home Teaching Toy, School Science Project, Education Subject