Balboa Sensor Assembly: 3/8" X 96" Water Temperature Sensor and 1/4" x 31" High Limit Sensor. Use this handy chart to test the temperature sensors ohms reading at various temperatures. Use a digital meter with sharp points. Ohms Temperature, 14.1K 110F, 14.7K 108F, 15.4K 106F, 16.2K 104F, 17.2K 101F, 18.1K 99F, 20.2K 94F, 25.5K 84F, 30.0K 77F, 40.0K 65F, 55.0K 53F, 95.0K 32FSensor Application Spa Control Sensor Type Temp and Hi Limit Application Balboa Water Group Model Balboa 4 Pin Connector Type 4 pin Sensor Diameter 3/8" & 1/4" Wire Count 2 wire/2wire Wire Length 31" & 96"

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