The TRIPLETT Model PH325 Long Tube pH Pen Long Tube pH Pen is an advanced pH measurement tool designed for precision and convenience. Its distinctive long tube design enables easy access to hard-to-reach areas, making it an ideal solution for a variety of applications. With high accuracy, a user-friendly interface, and automatic temperature compensation, this pH pen ensures reliable and efficient pH measurements. It features a simultaneous display of pH and Temperature angled perfectly for viewing, 1-point, 2-point, or 3-point calibration, and a Hold function to "freeze" the reading on the display for easy viewing. Waterproof (IP65). Includes two CR2032 batteries.