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Waterproof phtestr 30 is great for outdoor applications such as taking pH measurements in lakes and streams. Designed to Float in water, you can even attach a line to the housing for easy retrieval. Valox sensor housing resists most chemicals. The phtestr 30 has a replaceable sensor for easy maintenance. Double-junction electrode sensor handles wastewater and solutions containing sulphides, heavy metals, and TRIS. Electrode sensor offers a clog-resistant Kynar junction and a recessed, glass pH bulb to protect against breakage. The keypad clicks to confirm operation, and allows access to a variety of functions. Calibrate up to three pH points with the auto-buffer recognition at both USA and NIST standard buffers. Additional features include a automatic temperature compensation (ATC), hold function, Auto-off function, self-diagnostic error messages, and a three-segment battery-life indicator. Meter Kit adds: two single-use pouches of pH 4.01, pH 7.00, pH 10.0 buffer, and rinse solution, one sample jar, and sturdy carrying case. Versatile, compact design works in a field or laboratory setting 0.01 pH accuracy along with dual pH and selectable C or F temperature display a complete meter with key features at an economical price replaceable, double-junction electrode sensors save time and money IP67-rated housing sits flat on the table and Floats in water