【Easy to use】Water quality, precision, speed in 5 seconds. Plus, they have the best price, quality you can rely on, making this your first water test. [How Accurate? ] The pH resolution is 0.01 pH and the accuracy is ±0.01 HP. TDS: 0~9990ppm, Conductivity: 0~9990us/cm, Accuracy: ±2%. [Latest Model] The PH Pen has a self-calibration function to calibrate the PH Pen Tester without a screwdriver. The TDS pen has auto lock and close function. [Pocket Portable] Small size, but suitable for testing pH balance in drinking water, swimming pools, aquariums, systems RO, spas or hydroponics. 【Wide applications】Suitable for home and laboratory pH testing, including drinking water, electroplating solution, boiler water, aquarium water, swimming pool water, photo flushing liquid, well water, deep water, aquaculture, food processing, etc.
