Reflex level gauge glass is made from high borosilicate, they are used in level gauge in boiler for water position. Reflex type one side facing the medium chamber is provided with grooves . The molding process increases the resistance of the glass grooves to wear; the skin which the glass attains during molding gives it maximum smoothness and hardness.This makes it extremely resistant to the attack of boiler water.

With gasket protection, it can be used with all media at operating conditions up to 4MPa and temperatures up to 400 °C.（four hundred degrees celsius）