这个沙漏可调节范围是5 秒至3 分钟，不同类型的沙子材料
可以用于调查比较。专为一般或者定时的很多活动设计的。
沙漏定时器是用坚韧耐用的塑料制作而成的，并附有一系列
完整的很沙袋。
The Sand Timer is adjustable between 5 seconds and 3 minutes,Different types of sand and materials can be used for investigation.Designed for the many activities that require general or comparative timings to be taken.The Sand Timer is made from tough and durable plastics and is supplied with a bag of silver sand.Complete with product guide.
