Smart Portable pH Meter features ingenious gel-filled, double-life junction electrodes which are removable and replaceable for easy storage and maintenance. The double-cloth junction may be pulled out in 2mm increments as needed, providing a quick fix to clogged junctions and increasing meter longevity. 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 a 9v battery and 20 ml sachet of calibration solution. The Smart Portable pH Meter is backed by a two-year warranty, and the probes carry a 1-year warranty.