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PoolWarden pH Sensor - Industrial Pool and Spa Water Chemical Controller Probe The PoolWarden pH Sensor makes sure the sanitation in your spa water or industrial pool is functioning properly by maintaining the proper pH level. It uses standard 1/2-inch NPT (national pipe tapered) to ensure that the probe has a tight seal and will not cause leaks. This pH Sensor features blue color-coded electrode cap makes it easier to identify from the ORP. PoolWarden designed the pH Sensor with double junction construction to withstand constant use. Plus, it has a bulb guard that can be removed for easy cleaning. NOTE: pH sensors should not be exposed to freezing conditions. The sensor may incur damage if the outside temperature is below freezing.