Etekcity pH-009 Digital Pocket-Sized Pen Type pH Meter, Mini Water Quality Tester, pH 0.0 - 14.0 Measuring Range, 0.1pH Resolution Brand new and high quality, very accurate and durable With LCD display, measure & display pH results simultaneously The electrode will remain accurate for a long time without recalibration The electrode can be used in particularly taxing conditions Great for home and laboratory pH testing - aquariums, swimming pools, beverage