Solar Science Kit Digital Weather Station Kit contains the electrodes needed

Kit contains the electrodes needed and instructions - you supply the potato

3 sachets of Dawn detergent plus Guar Gum powder (makes bubbles stick together longer) plus recipe/instructions

and no more chart/ink management

but many fruits and veggies can be used instead

Solar Science Kit Digital Weather Station Kit contains the electrodes neededMake your own solar power generator and use it to power a small oven or water heater. Warning: it gets real hot, don't stick your hand in to check it. All necessary materials included (except the egg you cook) no batteries needed. For 11+. Part of the Green Science series, 21cm H by 17cm W by 6 deep.