EDTM.  The Glass-Chek Pro (model GC3000) is a digital glazing-measurement device designed for window installation, replacement, inspection, and fabricating professionals. The compact, portable unit can measure the glass and airspace thickness of single-, double-, and triple-pane windows from just one side of a window, including windows with suspended films, tinted glass, and low-E coatings. According to the manufacturer, it is an indispensable tool for identifying products in the field and to prevent costly mistakes when various types of glazed products are installed in the same location. 419.861.1030. 
http://www.edtm.com/.
EDTM. The Glass-Chek Pro (model GC3000) is a digital glazing-measurement device designed for window installation, replacement, inspection, and fabricating professionals. The compact, portable unit can measure the glass and airspace thickness of single-, double-, and triple-pane windows from just one side of a window, including windows with suspended films, tinted glass, and low-E coatings. According to the manufacturer, it is an indispensable tool for identifying products in the field and to prevent costly mistakes when various types of glazed products are installed in the same location. 419.861.1030. http://www.edtm.com/.

EDTM

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The Glass-Chek Pro (model GC3000) is a digital glazing-measurement device designed for window installation, replacement, inspection, and fabricating professionals. The compact, portable unit can measure the glass and airspace thickness of single-, double-, and triple-pane windows from just one side of a window, including windows with suspended films, tinted glass, and low-E coatings. According to the manufacturer, it is an indispensable tool for identifying products in the field and to prevent costly mistakes when various types of glazed products are installed in the same location. 419.861.1030. http://www.edtm.com/.