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Ferrite blocks
Ideally suited to woodblocks and tambours
Ideal for ages 4 to 8 years
A useful tool in various electrostatic experiments - Behaves similarly to a digital electroscope
Mechanical Stopwatch Ferrite blocksMechanical Stopwatch. Start Stop Reset Function can be operated by the crown. Manual winding 13 Ruby. Case: chrome plated metal. Measuring range 15 minutes. Resolution: 1 10 second. Diameter: 5 cm. Premium Quality: Mechinal Stopwatch is made of high grade construction all the way through, excellent build quality and proven reliability across the range. Designed for use in professional laboratories but is an ideal choice for science classrooms and
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