A system andor method for sensing the presence of moisture andor other material on a window such as a vehicle window. A plurality of vectors are generated. A desired degree of microetch is provided on an aluminosilicate glass disk substrate, for example, by immersion for 2-4 hours at 360 C. The offset-angle adapter includes a first adapter arm portion having a first arm outer diameter and a second adapter arm portion having a second arm outer diameter.