Ruler, Center Groove, 12 in
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1 Ruler 12 in Wood Center Groove, without holes
1. Ruler MUST have center groove, item is used to roll marbles down
2. Rulers measure 12″/30cm
3. Includes both US and Metric scales
4. No holes should occur in groove as this will impede marble
- Used in Physics experiments involving marbles to explain certain concepts.