The Low-E CARD+ offers a replaceable battery design that can be used indefinitely. This "+" model will differentiate if the Low-E coating is on Surface 1, Surface 2, or indicate if the glass is uncoated (Clear). There are no metal contacts and the product can be used to test all types of glass. Therefore it is safe to use on all glass, even if the glass is dirty or has a label or other insulating layer on it.

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