[Easy to use] Know the water quality in 5 seconds, accurate and faster. A combination of this set of TDS PH EC temperatures. Also, it has the best price, reliable quality, all of which make it your first water test. [DURABLE MODEL] The PH pen has an auto-calibration function to calibrate the pH test pen without any screwdriver . The TDS pen has a locking and auto-off function. [Pocket Portable] Small but suitable for testing pH balance in drinking water, swimming pools, aquariums, reverse osmosis systems, spas or hydroponics. 【Wide Application】Suitable for home and laboratory pH testing, including drinking water, electroplating solution, boiler water, aquarium water, swimming pool water, photo flushing fluid, well water, deep groundwater, aquaculture, food processing, etc.
