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PORTABILITY + RELIABILITY –– The top-rated pH tester is now paired with the Swiss LabSen 835 pH/temp. electrode, allowing you to effortlessly take lab-grade pH measurement for strong acidic solutions or HF-containing solutions wherever you go. SWISS SENSOR TECH –– Crafted with Swiss sensor technology and premium materials, the LabSen electrode’s specialized HF membrane is resistant to hydrofluoric corrosion and minimizes acidic error. MEASURING HF –– LabSen 835 pH electrode is capable of measuring solution containing HF acid for up to 1000 times. (measurement time