Γεννήτρια ισχύος φρούτων
Gelsonlab HSTM-075 Education Science Toys Γεννήτρια ισχύος φρούτων Fruit clock
Through the Γεννήτρια ισχύος φρούτων, let the children know the phenomenon of electron flow formed by the replacement of copper, iron and zinc plasma with different materials in acidic or alkaline liquid.