By keeping contact with instrument company to obtain the sufficient application technical support and repair service in time.
保持与仪器公司联系，以及时获得足够的仪器应用的技术支持。
The steelyard clepsydra, a special type of clepsydra, had been a chief time-keeping instrument during the Sui-Tang period a nd the earlier stage of Northern Song dynasty.
秤漏是一种特殊类型的漏刻，在隋唐及北宋前期曾是司天机构的主要计时仪器。
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