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Hydrion Insta-Check 0-13 pH Paper Refill Single jumbo (1/2 tape) roll of 50 Insta Check 0-13. Wide range general use paper. Find color match in seconds. 14 different colors across pH range.
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Hydrion Insta-Check 0-13 pH Paper Refill Single jumbo (1/2 tape) roll of 50 Insta Check 0-13. Wide range general use paper. Find color match in seconds. 14 different colors across pH range.
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