The ETEKT + Low-E Coating detector is the industry standard for instruments detecting the presence and location of thermal resistant coatings (Low E) used on energy efficient single and dual lite glass and window assemblies. The ETEKT+ is a rugged handheld device that is accurate, easy to use, and rarely requires calibration. Place the unit flat on the glass surface, press the button and read the results. This fully functional unit has never been used. Wife bought it for me as a gift but I don't need it. Paid 300 with taxes so save while you can. These units are rarely available and the Canadian supplier is currently out of stock. Serious buyers only reply.