An accurate pH pen for the instant testing of acidity levels in paper, board, envelopes, file folders, etc.
Preservation quality storage materials require a pH of at least 7.0 and often an alkaline buffer for them to last hundreds of years or more.
Simply mark an inconspicuous edge of the material and the indicator solution will dry in seconds indicating a color. Purple for pH 6.8 or above and a clear or yellow color for acidic materials.
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