Description
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).