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or switched to allow the user independent control of the wave and strobe frequencies giving the impression of wave motion across the viewing screen
The pieces interlock together with ease and can be used indoors or outdoors
15 cards for At Home including doorbell
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Forcemeter, Two Way, Beige, 10N (Each) Flipchart Easels or switched to allow theThe two way forcemeter are ideal for using thegrams scale for a mass activity andthe newton's scalefor a force activitiesTransparent acrylictubular body with dual scale grams and newtons
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