Water pH Meter Kit: A very comprehensive kit for checking the pH of pure, potable water, tap, tap, recovery, beverage or 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 only need no tools, just dip the electrode of the pH meter 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 pen for TDS is self-calibrating and can be used directly, the pen for PH must be calibrated, therefore in the package there are several sachets with powders of different ph. the pH tester self-calibrates at three points (6.86 and 4.01 point calibration). Electronic pool pH tester with accurate digital display: use the digital meter to get the accuracy numbers 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 for measuring pH water, the other to measure the rate of dissolved solid particles in the water itself. TDS / PH testers have small dimensions and light weight like a pen.