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Macherey-Nagel MN 90214 (pH 12.0–14.0 with 0.5 pH increments, Pack of 100 test strips) Premium High-Alkaline pH Indicator Strips manufactured in Germany. Featuring proprietary non-bleeding chemical indicator bonding technology where reactive dyes do not dissolve or bleed into caustic solution samples, ensuring crisp color matching and accurate caustic alkali (NaOH/KOH) strength testing without sample contamination.