What is the difference between reflex glass and transparent glass?
Reflex Glass – allows light striking the area of the glass covered by liquid to pass to the interior of the gauge so the area appears dark. Light striking the open space above the liquid level is reflected back to the observer, so that area appears silvery similar to a mirror.
Transparent Glass – is used to see both the level of a liquid and its characteristics. Clear glass is mounted on the front and back of the gauge. This permits direct observation of such characteristics as color or the interface between two unmixable liquids in the same system.