Water pH Meter Kit: A very complete kit for checking the pH of pure and drinking water, from tap water, to reclaimed water, beverages or swimming pools. It can also be used to test aquarium water and the water we use for hydroponics, aquaculture, food processing. Easy to use swimming pool pH tester: You don't need any tools, just dip the pH meter electrode into the solution. Press "ON / OFF" to open the electronic pH meter, shake gently and wait a few seconds until the readings stabilize. And these 2-in-1 pH and TDS meters are also ideal for home or laboratory testing. Easy Calibration pH Tester: The TDS pen is self-calibrating and can be used directly, the PH pen needs to be calibrated, that's why in the package there are several sachets with powders of different pH. The pH tester is automatically calibrated on three points (calibration at 6.86 and 4.01 points). Accurate Digital Display Electronic Pool pH Tester: Use the digital meter to get the precision numbers instead of comparing the color with the pH test paper, avoid making the precision due to the different light, also useful for those who are weak in color. Comes in a package containing 2 in 1: one to measure the pH of the water, the other to measure the rate of dissolved solid particles in the water itself. TDS/PH testers are as small and light as a pen. Portable PH, TDS and EC meters are multifunctional professional kits. They can be widely used for many water quality testing applications: pure water production and consumption, tap water, well water, seawater, aquarium water, swimming pool water, early rupture of amniotic fluid, etc. 3 in 1. Upgraded with a large LCD display for easier reading High-precision measuring range is wide from 0 to 9990 PPM Auto-off after 10 minutes with inactive Automatic Temperature Compensation (ATC) One button (HOLD) locks the test result No calibration required: The TDS meter has been calibrated during production. Features: The measuring range of the sensitive electrode sensor is 0.00 to 14.00 pH. One button (CAL) calibrates the Meter Large screen display, data is clearer than before. Automatic shutdown after 9 minutes of inactivity.