It features high ?0.01 pH accuracy, simultaneous pH and temperature (?C) display, pH range – 1.0 to 15.0 pH, three point push-button calibration, double junction electrode ideal for dirty water, heavy sulfides and organics. Increased reference gel volume offers significantly longer electrode life. Certifiable to IP67 standards-waterproof and dust proof housing floats. Replaceable sensor lets you reuse same meter body, saving you money. Automatic temperature compensation.