The reflective gauge glass is produced according to the hg5-1364~1370-80 standard of the former Ministry of Chemical Industry. It is suitable for direct indication of the medium level in various towers, tanks, tanks, tanks and other containers. The upper and lower valves of the instrument are equipped with safety steel balls. When the glass is accidentally broken, the steel ball can automatically close the liquid flow channel under the pressure in the container to prevent the liquid level from continuing to flow out. Direct reading, accurate and reliable reading, Simple structure, convenient maintenance, safe and durable to use.