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If the second device doesn't connect automatically
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VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium, with ATC, Army Green auspowers_batchfour If the second device doesn'tVIVOSUN PH Meter Digital PH Tester Pen 0. 01 High Accuracy Water Quality Tester with 0 14 PH Measurement Range for Household Drinking, Pool and Aquarium, with ATC, Army Green Product Features High Accuarcy: Tester has a sensitive electrode sensor to read accurate PH levels; the included detailed manual will show you how to get the best accurate and stable reading Easy to Calibrate: Press CAL for 5 seconds to enter the calibration mode, press in turn
