KETOTEK Water Quality Test Meter, Ph Meter Tds Meter 2 in 1 Kit with 0-14.00PH and 0-9990 ppm Measure Range for Hydroponics, Aquariums, Drinking Water, Ro System, Pool and fishpondMORE CONVENIENT IN USING. 5 seconds to get the data of PH or PPM, know the water quality accurately. The pen meter partner also can be separately used whenever you need. WIDELY USED AND ACCURATE. Digital TDS meter has measurement range 0 9990ppm and 2% accuracy, PH meter has measurement range 0. 00 14. 00PH, 0. 01PH accuracy and 0. 01PH resolution. AUTO OFF FUNCTION AND EASY TO USE. TDS pen meter and PH pen meter both have the function of Auto off to