Reflex Type Level Gauge
The gauge is so built as to fasten up a reflective glass, which is a long thick flat tempered glass with provided some grooves on one side of it, in between a gauge body and cover with bolts, facing the grooved side to liquid in the body. The gaseous part appears silvery white as the incident light is reflected on the grooves, while the liquid part appears black as the light goes into the liquid without reflection. Therefore, liquid level can be indicated distinctly even if the gauge is applicable for a clear transparent liquid.