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Extech's Spare ExStik II Dissolve Oxygen Module is perfect for measuring dissolved oxygen in a variety of applications. Featuring a screw-on membrane cap for easy replacement, this module is designed for the DO600 Waterproof ExStik II DO Meter. Its bulb tip shape ensures accurate measurements and its operating temperature range of 32 degrees to 122 degrees F allows for use in various environments. With a measurement range of 0 to 200% and 0 to 20mg/L, this module is ideal for detecting even the lowest levels of dissolved oxygen. Whether you're monitoring aquatic systems or industrial processes, the ExStik II Dissolve Oxygen Module provides precise and reliable measurements.