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1. Cut the yellow plastic wire into half length, and peel the skin on the two terminals of the wire by 4cm.
2. Install the dry battery cover (yellow), and the tester cover (red), pass the wire through the cover, fold it over, put it in.
3. When placing the battery in the battery case, be careful not to mistake the direction of the battery.
4. Insert the small bulb head into the battery compartment.
5. Embed the notch of tester A into the projection of tester B.
1. Close to life and teaching materials to stimulate curiosity.
2. Bring different scientific and meticulous experiences to children.
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