Product Description Irrometer WS1 AC Soil Moisture Sensor & Module 24VAC. NO or NC. c/w Probe. The Irrometer WaterSwitch is an add-on product for Rain Bird (and other manufacturers) controllers that works with existing valves or controllers to improve irrigation efficiency based on plant demand. The module will prevent irrigation cycles by signalling the controllers sensor circuit or interrupting the solenoid power, when the soil moisture status is wetter than the adjustable set point. The kit includes one or two moisture sensors and has nine moisture set points allowing for a wide range of variation in plant and soil type. An indicator light flashes to show status. Features EPA WaterSense Approved WS-DC – For any battery powered controller equipped with a sensor circuit WS-AC – For standard controllers using the sensor circuit or as a common interrupt of the valve Suspends irrigation cycles based on soil moisture status Nine position switch for variations in plant demand and soil type Requires no seasonal adjustments NO / NC -Normally Open / Normally Closed 2 Options Available Irrometer WS1 AC Soil Moisture Sensor & Module 24VAC. NO or NC. c/w Probe. Irrometer WS1 DC Soil Moisture Sensor & Module 9v. NO or NC. c/w Probe. Click for Product Brochure Click for Information Documents Click for Instruction Manual