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The hourglass is made of high borosilicate glass ,transparent and clear, hand-blown, so the hourglass can not used to measure time accurately.The standard error range is +-6s/mins. 3minues(2mins42s -3mins18s) 5mins(4mins30s-5mins30s) 30mins(27mins-33mins) 60mins(54mins-66mins).
There are many choices for your choosing,3 minutes-Black,5 minutes-Copper,30 minutes-White,Dark Browm,Black Beauty and Sunburn,60 minutes-Cocoa,Gold and Pirate Black.
The hourglass sand timer is both a work of art and a useful tool for your life. Perfect to help manage work and break times easily, and make it much easier to cultivate children's sense of time.
Great gift for your Home or Office. Innovative decorations on your Desk. Useful tool for Science and Education.
Warranty - Send info's to our customer service team if any hourglass was damaged during shipping.The issue will be solved as soon as possible.