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Blue litmus paper turns red at pH 6.5 or less (acidic). Strips measure 7 x 48 mm. Note: Not for measuring the pH of natural waters, such as streams, rivers and lakes. Vial of 100 strips.

Blue litmus paper turns red at pH 6.5 or less (acidic). Strips measure 7 x 48 mm. Vial of 100 strips.

Note: Not for measuring the pH of natural waters, such as streams, rivers, and lakes. To measure pH in these waters, try pH and Total Alkalinity Water Test Strip, pH 6-9 (item #652729), or for a wider pH range, LaMotte® Wide-Range pH Water Test Kit, pH 3.0-10.5 (item #652927).