The pH Tester is the perfect device for testing the pH of your swimming pool water with the press of a button. Included with the tester are three pH buffer powders for calibration and replaceable batteries are already installed on the tester. Users may find it useful to reserve the buffer solutions for future recalibrations. A plastic cover protects the probe between uses. Instructions for calibration and general use are also included with the pH Tester. Provides a near instantaneous pH reading of a liquid down to 0.1 pH resolution, making your daily check that much quicker and easier. If you are currently SLAMing and cannot use R-0014 to test your pH, this tester is unaffected by high free chlorine levels and can be used during SLAM.