The hourglass is made of high borosilicate glass ,transparent and clear, 100% 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).
Multi-Choices Hourglass: This hourglass is available in 3 minutes, 5 minutes, 30 minutes as well as 60 minutes. And offers different colors to match the different durations of the hourglasses.
Time Helper: 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.
Hourglasses For All Occasions: 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.Thanks
