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Apera Instruments Premium Series PH60F Flat pH Tester tests pH level for skin, textiles, paper, and other flat surfaces in an reliable and easy manner (Also works great for general water solution's pH testing). Up to 3 points (4. 00, 7. 00, 10. 01) of auto. calibration and 0 to 50˚C Auto. Temperature Compensation (ATC), 0. 01 pH, 0. 5˚C accuracy within -2. 00 to 16. 00 pH measuring range, auto. recognition and reminders of stable values improves consistency, saving you the trouble of guessing when to manually hold measurement (auto. hold function is also available). The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.