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Thermochromic Ruler
Thermochromic Ruler
Regular price
$4.99
Purple - $4.99 USD
Red - $4.99 USD
Orange - $4.99 USD
Green - $4.99 USD
Blue - $4.99 USD
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Make math even more exciting with these thermochromic rulers! Observe as their color lightens when exposed to a heat source.
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