NSE Sight Glass 
NSE-type sight glass installed in the piping of the refrigeration, air conditioning equipment, to show the moisture content of the refrigerant in the system andThe flow of refrigerant or lubricating oil in the tube, can also be used to indicate the compressor crankcase oil level, so that at any time Observations, to determine the operational status of the system, and take timely measures to ensure the normal operation of the device's safety.
