v easy to use Measure water quality, accuracy and speed in 5 seconds. This TDS PH EC temperature setting. In addition, they have the best prices and reliable quality, making it your first water test. How accurate is it? The pH resolution is 0.01 pH with an accuracy of ±0.01 HP. TDS: 0~9990 ppm, conductivity: 0~9990us/cm, accuracy: ±2%. Newest model The PH pen has an automatic calibration function, which allows you to calibrate the PH tester pen without a screwdriver. The TDS pen has automatic lock and shut-off features. Pocket notebook Small but suitable for testing the pH balance of drinking water, swimming pools, aquariums, reverse osmosis systems, spas or hydroponics. Wide range of applications Ideal for home and laboratory pH testing, including drinking water, plating solutions, boiler water, aquarium water, swimming pool water, photographic developing fluid, well water, deep groundwater, aquaculture, food processing, and more. Soil tester soil moisture measurement pH value, three