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Set of 20 See and Solve Number Puzzles in one giant bumper pack
Operates on 12 volts power supply which is not included
Gummed on one side
Users can select the effective length of the tube by positioning the stopper and closing the gas tap
• 12 x cell holders (without cells)
1K Potentiometer Age 4-5 Set of 20 See andA convenient, box mounted potentiometer for various electrical experiments, 4mm safety sockets are provided. Range : 0 1K ohms, 3W + 5% continuously variable.
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