产品名称 | Sand Timers |
产品货号 | WARD470002-844 |
产品价格 | 现货询价,电话:010-67529703 |
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产品品牌 | vwr |
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The hourglass sand timer became the ultimate expression of flowing time measuring a unit because the dried sand passed from one container to another through a narrow opening without being affected by weather. This handy set of Sand Timers, a one-minute timer and a three-minute timer, allows you to teach time concepts visually! Students get caught up in the thrill of competing against the tiny grains of sand.
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