Professional Quality LCD Digital PH Meter Pen Portable Auto Calibration PH Tester This super portable PH tester pen is the perfect tool to test the PH levels & purity of fluids. Evaluates quality of purified water, electroplating liquid, & monitoring water in pools & tanks. High-end microprocessor technology w/ ATC capability for convenient & reliable PH data analysis. Comes with a PROTECTIVE STORAGE CASE, and 3 various CALIBRATION POWDER SOLUTIONS. Extra-wide & waterproof LCD DIGITAL SCREEN lets you easily read the displayed value while measuring.