water pH meter kit: A very complete kit for checking the pH of pure and drinking water, tap, tap, recovery, beverage or swimming pool water. It can also be used to test aquarium water and the water we use for hydroponics, aquaculture, food processing. Easy to use pool ph tester: you don't need any tools, just dip the pH meter electrode in the solution. Press "ON/OFF" to open the electronic pH meter, shake lightly 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 pen for the PH must be calibrated, that is why in the packaging there are several sachets with powders of different ph. the pH tester automatically calibrates on three points (6.86 and 4.01 point calibration). Electronic pH tester for swimming pools with precise digital display: use the digital meter to obtain the precision figures instead of comparing the color with the ph test paper, avoid making the accuracy 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 level of solid particles dissolved in the water itself. TDS / PH testers have small dimensions and low weight like a pen.