Digital pH Meter and TDS Combo, High Accuracy pH Tester 0.05 ph +/- 2% Reading Accuracy TDS Tester, Water Quality Tester for Home Drinking Water , swimming pool, hydroponics, aquarium water, yellow 4 in 1: a very complete kit to check the quality of your water, whether it comes from #39;a faucet, a hot tub, a home brew, an indoor floor, an aquarium, hydroponics or a garden. swimming pool. TDS tester and PH tester as the pens are small in size. , lightweight and easy to carry when you go out. EASY TO USE: When you press the 'HOLD' button, the TDS water tester locks the measurement and stops. 39;s automatically turns off after a few minutes of inactivity. The pH tester has a self-calibration feature so you can get a reading quickly. High accuracy: pH meters range from 0.00 to 14.00 (PH), while the digital EC and TDS meters range from 0 to 19,990 ppm. PH resolution is 0.01 pH, accuracy 0.05 pH. The pH tester automatically calibrates at three points (only 6.86:0.1 pH accuracy). You don't need any tools; Simply remove the protective cap and immerse the pH meter electrode into the solution. Press "ON/OFF" To turn on the electronic pH meter, stir gently and wait a few seconds until the reading stabilizes. What you get in the package: TDS-EC meter tester . pH tester. 3 PH calibration pouches. Instructions for use.< /p>