MULTIFUNCTIONAL & PROFESSIONAL - functional water purity tester set provides exact and accurate reading in 5 seconds. tester set is a combo of TDS PH EC Temperature. With big LCD, you can easily read reading for water, swimming pools, hydroponics, fishpond & moreRELIABLE ACCURACY - PH Meter has 0.01pH resolution, accuracy 0.05PH. Digital TDS meter has a measurement range of 0~9990ppm and 2% accuracy. EC ranges from 0 ~ 9990 us/ cm, 2% accuracy. The testing data from PPM meter and PH Meter all are reliable and practical.EASY TO USE - Our simplest yet fastest PH pen has AUTO CALIBRATION function. To calibrate the PH pen tester does not require screwdrivers. TDS pen has LOCK & AUTO SHUT OFF function. The PH and TDS meter both are easy to use.SMALL SIZE AND PORTABLE - Instead of forking out for a costly lab test, take lab-grade measurements for PH/ MV and Conductivity/ TDS/ ity in a quick manner with our digital water quality test meters. Small but for testing PH balance of RO system, spa, Ro System, pool, or hydroponics. Take it in your pocket where you go out.