Do you know the error of grounding resistance test and repair?

Earth resistance testing is one of the most important maintenance methods involved in the normal operation of safety and electrical equipment. In the past spring maintenance work, we found that individual units are often grounded only when the socket grounding socket tester checks correctly, .......

Google submits the latest patent application for wear-free sensors

[China Instrument Network Instrument Development] Google recently submitted a new patent that describes a patented wear-free sensor placed on the ceiling. The sensors monitor the user's sleep status via infrared light and can also track the user's heart rate and breathing.
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