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How long will the line remain visible?

April 26, 2017line remain visible

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How long will the line remain visible?

1 Answer

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Posted

The test should be read at 3 minutes for best results. A positive (Surge) result will never disappear. The colored line(s) may become darker and a tinted background may appear after several hours. Some negative results may later display a faint second color line because of evaporation from the test region. Therefore, you should not read the result after 10 minutes and discard the test device once you have read the result.