After-sale

The instrument appear quality problems, we will free repair during the warranty periods.

Explain the performance and characteristics of the instrument, the structure and operation of the instrument, the introduction of relevant components, the maintenance of the instrument, the explanation of instrument testing, and the general knowledge of calibration.

Establish a system of after-sale return visits and fill in the feedback form to understand the use of the user's instruments. If you have any special questions to consult, please call Beijing Niuyin after-sales service.