1 of 2 people found the following review helpful
Brilliant - surprisingly instant and dramatic reaction for so little money.,
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This review is from: Hand Boiler (Toy)
Novelty scientific toy. Amazingly reactive - works instantly at the touch of your hand. Liquid immediately starts moving up the tubes when you hold the bottom bulb in your hand. Hold other bulb instead to reverse the direction, or allow it to settle itself over time. Fascinating. Obviously quite fragile as made of a tin glass tube, but no moreso than say a wine glass, so safe in adult / older child's hands. Good teacher present.