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21st Century NY Balance

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#1451 21st Century Balance. This patent pending ""New York Balance"" is the first major advancement in an educational device for teaching simple machines in decades.  What makes this unit so special is an internal sliding weight mechanism that allows you to neutralize all factors after the fulcrum and positions of force have been established.  This gives you an inexpensive piece of testing equipment that rivals high priced computerized apparatuses used to study similar effects.