Digital pH Meter, JER Water PH Tester for Household Drinking Water, Aquarium, Swimming Pools and Hydroponics, 0.01 pH Resolution 0.00-14.00 Range, Large LCD Display, Pocket Size
Very accurate. Compared with other testers and this one was the one I trusted most. Gave me readings I would expect when I tested water before my water softener, after my water softener, and then after my RO/DI filter.