The 8 Best Water Testing Kits of 2021 - The Spruce
Buy Indigo™ brand 400ppm QAC QR quick response test strips; only 7.50 per 100 strips!.Buy more & save with our extended shelf life.. Indigo™ brand test strips are Made in USA & tested for accuracy using NIST compliant standards. Indigo™ QAC QR test strips are ideal for confirming the strength of quaternary ammonium sanitizers in the 200-400ppm range as recommended for soaking & manual ...
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