Check the listing for details. Vantakool pH Meter Tester Digital Water Quality Test Kit, pH 4.00 Buffer. Condition: Used. Listed at 12.00 USD. Unleash laboratory-grade precision with this Vantakool pH Meter, your ultimate companion for meticulously testing water quality! In working used condition. This handheld digital device offers unparalleled accuracy, making it ideal for a range of applications. It comes complete with a pH 4.00 buffer powder to ensure accurate calibration right out of the box. The sleek design and easy-to-read digital display make it user-friendly for both professionals and hobbyists. Envision the satisfaction of perfectly balanced pools, thriving hydroponic gardens, or precisely formulated brewing solutions. Whether you're managing an aquarium, conducting scientific experiments, or ensuring the purity of your drinking water, this pH meter delivers the reliability and control you need.