Check the listing for details. CAL SPAS ATS Sensor Assembly Spa Hot Tub Water Temperature 1/4" Sensor Probe. Color: Black, Condition: New. Listed at 13.99 USD. This is a after market WaterTemperature Sensor (flow sensor) Probe 1/4" (6.4mm) diameter bulb with 3m (10ft) cable and temperature range of -58 to 230 °F (-50 to 110°C) that compatible for many Hot tub sensors (the bulb diameter size is 1/4", so please check the sensor size before buying) This water proof sensor has a wide range of application but before buying, please check the dimensions and specifications on picture and following table that you select suitable sensor for your application. Specifications: Measurement range: -58 to 230 °F (-50 to 110 °C) Cable length (L): 10 ft (3m) Sensing tip material : stainless steel water proof Sensing tip length size: 39mm (1.5")sensing tip bulb diameter: 1/4" (6.4mm)Check the picture for more information Sensor cable type: 2 wires with water proof gray PVC cover ********** We could offer a wide range of sensor. ********** You name your inquiry, we produce it for you. For more information or ordering larger volumes please contact us. Our shipping service is fast for example:shipping to USA is 3-6 business daysshipping to England and Ireland is 4-7 business daysshipping to other Europe Countries 5-10 business daysshipping to Canada is 5-14 business days shipping to Australia, New Zealand and Asia takes longer than other countries (17-25 Business days)