{"product_id":"w1209-dc-5v-12v-digital-temperature-controller-switch","title":"W1209 DC 5V-12V Digital Temperature Controller Switch","description":"\n\u003ch2\u003eW1209 Digital Temperature Controller — Precise, Versatile \u0026amp; Easy to Use\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eW1209 DC 5V–12V Digital Temperature Controller\u003c\/strong\u003e is a compact, highly accurate thermostat switch designed for a wide range of heating and cooling applications. Whether you're managing an incubator, aquarium heater, greenhouse, reptile enclosure, or DIY electronics project, this all-in-one thermometer and control switch gives you reliable, programmable temperature management in a slim, low-profile module.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Mode Control:\u003c\/strong\u003e Supports both \u003cem\u003eheating\u003c\/em\u003e and \u003cem\u003ecooling\u003c\/em\u003e modes — easily switch between them to suit your application.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Compatibility:\u003c\/strong\u003e Operates on DC 5V to 12V, making it compatible with most standard power supplies and DIY setups.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Accuracy:\u003c\/strong\u003e Built-in NTC sensor delivers precise temperature readings with ±0.1°C resolution and tight tolerances.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgrammable Set Point:\u003c\/strong\u003e Configure your desired trigger temperature and hysteresis via the onboard buttons — no external programmer needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClear LED Display:\u003c\/strong\u003e Bright 3-digit LED readout for easy, at-a-glance temperature monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelay Output:\u003c\/strong\u003e Integrated relay switch allows direct control of heating elements, cooling fans, pumps, and more.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Small PCB size makes it ideal for panel mounting or embedding in enclosures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Temperature Range:\u003c\/strong\u003e Measures and controls from -50°C to +110°C, covering virtually any everyday use case.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e DC 5V – 12V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasurement Range:\u003c\/strong\u003e -50°C to +110°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.1°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eControl Mode:\u003c\/strong\u003e Heating \/ Cooling (selectable)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelay Capacity:\u003c\/strong\u003e 10A \/ 250VAC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisplay:\u003c\/strong\u003e 3-digit red LED\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor:\u003c\/strong\u003e NTC waterproof probe (included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in Mainland China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIncubators \u0026amp; hatchers\u003c\/li\u003e\n  \u003cli\u003eAquariums \u0026amp; fish tanks\u003c\/li\u003e\n  \u003cli\u003eReptile \u0026amp; terrarium heating\u003c\/li\u003e\n  \u003cli\u003eGreenhouses \u0026amp; grow tents\u003c\/li\u003e\n  \u003cli\u003eHome brewing \u0026amp; fermentation chambers\u003c\/li\u003e\n  \u003cli\u003eDIY electronics \u0026amp; automation projects\u003c\/li\u003e\n  \u003cli\u003eHVAC \u0026amp; fan control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × W1209 Temperature Controller Module\u003c\/li\u003e\n  \u003cli\u003e1 × NTC Waterproof Temperature Probe Sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the difference between heating and cooling mode on the W1209 temperature controller?\u003c\/h4\u003e\n\u003cp\u003eA: In \u003cstrong\u003eheating mode\u003c\/strong\u003e, the relay activates when the measured temperature drops below your set point, turning on a heater until the desired temperature is reached. In \u003cstrong\u003ecooling mode\u003c\/strong\u003e, the relay activates when the temperature rises above the set point, triggering a fan or cooling device. You can switch between modes by pressing and holding the set button during configuration.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What voltage does the W1209 DC temperature controller require?\u003c\/h4\u003e\n\u003cp\u003eA: The W1209 temperature controller switch operates on \u003cstrong\u003eDC 5V to 12V\u003c\/strong\u003e, making it compatible with USB power banks, standard 12V adapters, and most DIY electronics power supplies. Ensure your supply can deliver sufficient current for both the controller and any relay-driven load.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can the W1209 thermostat control both heating and cooling devices at the same time?\u003c\/h4\u003e\n\u003cp\u003eA: The W1209 features a single relay output, so it controls one device at a time — either a heating element or a cooling device, depending on the mode selected. For independent simultaneous heating and cooling control, two separate W1209 modules would be needed, each configured for its respective mode.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the temperature probe waterproof?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the included \u003cstrong\u003eNTC temperature probe\u003c\/strong\u003e is waterproof and suitable for use in wet or humid environments such as aquariums, hydroponic systems, and fermentation setups.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between heating and cooling mode on the W1209 temperature controller?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"In heating mode, the relay activates when the measured temperature drops below your set point, turning on a heater until the desired temperature is reached. In cooling mode, the relay activates when the temperature rises above the set point, triggering a fan or cooling device. You can switch between modes by pressing and holding the set button during configuration.\"}}, {\"@type\": \"Question\", \"name\": \"What voltage does the W1209 DC temperature controller require?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The W1209 temperature controller switch operates on DC 5V to 12V, making it compatible with USB power banks, standard 12V adapters, and most DIY electronics power supplies. Ensure your supply can deliver sufficient current for both the controller and any relay-driven load.\"}}, {\"@type\": \"Question\", \"name\": \"Can the W1209 thermostat control both heating and cooling devices at the same time?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The W1209 features a single relay output, so it controls one device at a time — either a heating element or a cooling device, depending on the mode selected. 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