The Champ® pH Tester is an affordable, easy-to-use pH pen that comes ready-to-use, with a pH probe, protective cap, instructions, and a long-lasting battery providing up to 400 hours of continuous use. This tester measures pH with a range of 0.0-14.0 pH, 0.1 pH resolution, an accuracy of ±0.2 pH and features 1-point calibration. Calibration solution not included.