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Industrial Test Systems 481104 WaterWorks pH Check HAWA auspowers_batchtwo Our magnifying glass can easilyIndustrial Test Systems 481104 WaterWorks pH Check Direct from the Manufacturer USA WaterWorks Extended Range pH test strips 481104 BOTTLE CONTAINS 50 TEST STRIPS FOR MEASURING EXTENDED RANGE PH. Our test strips contained in this kit gives assurance with testing through our dual padded indicators. Separate color pads on the indicator provide easier and more accurate testing when reading results. No need for calibration with these strips like pH