Plasma Ball Lamp
Science doesn't get any cooler than this - Tesla's plasma ball is a lamp and science experiment in one, as it's a colourful way of observing electrical discharges. The globe itself is filled with three inert gases (neon, argon and xenon), and a high frequency electrode is in the centre. Place your fingertips on the lamp and watch the filaments glow. The plasma ball is 15cm in diameter. Nifty! Age guide: from 8 years.
Warning: this item is not a toy and should not be placed near sensitive electronic equipment, and is not suitable for people with a pacemaker.
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