Smart Portable pH Meter features ingenious gel-filled, double-life junction electrodes which are removable and replaceable for easy storage and maintenance. The meter measures pH with a range of 0.0 to 14.0, resolution of 0.1 pH and an accuracy of ± 0.2 pH. Calibration is 2-point manual. The unit comes complete with probe,  nine-volt battery, and 20-mL sachet of calibration solution. The Smart Portable pH Meter is backed by a two-year warranty, and the probe carries a 1-year warranty.