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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. Packaged in 12 vials; 100 strips per vial.

Blue litmus paper turns red at pH 6.5 or less (acidic). Strips measure 7 x 48 mm. Packaged in 12 vials; 100 strips per vial.

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).