pH Water Meter Kit: A very complete kit for checking the pH of pure and drinking water, tap water, domestic water, beverages or swimming pool. It can also be used to test aquarium water and the water we use for hydroponics, aquaculture and food processing. Easy to use pool pH tester: No tools are needed, just immerse the pH meter electrode in the solution. Press "ON/OFF" to open the electronic pH meter, shake it gently and wait a few seconds for the readings to stabilize. And these 2 in 1 pH and TDS meters are also ideal for home or lab testing. Easy to Calibrate pH Tester: The TDS pen is self-calibrating and can be used directly, the PH pen needs to be calibrated, which is why there are several bags of powders of different pH values in the package. The pH tester automatically calibrates at three points (calibration at 6.86 and 4.01 points). Electronic pH tester for swimming pools with precise digital display: Use the digital meter to get the precision values, instead of comparing the