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Stock Photo: Hand holding strip of pH paper in front of specimen, with comparison chart Image ID: 8870989   Release  information: N/A   Copyright: Christina Richards   Keywords: acid, analysis, base, beaker, biohazard, biology, biotech, chart, chemical, chemistry, color, colorful, compare, concentration, finger, hand, health, healthcare, indicator, jar, lab, laboratory, liquid, measure, medicine, ph, plastic, reagents, research, sample, science, strip, technology, test, urinalysis, urine, yellow Similar Images Preview test paper resting on specimen with... some human urine in a sample... some human urine in a sample... resting on specimen with... strip of ph paper resting on... some human urine in a sample... strip of ph paper resting on...