Product description
Twist, Set, Control—Temperature Made Simple!
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. WILLHI WH2408 TEMERPATURE CONTROLLER Merchant Video
Due to thermal inertia, the temperature may keep rising after heating stops. This is normal.
To reduce the overshoot, consider using a lower power heater or adjusting your setpoints accordingly.
Craft your brew with precision heat 
Control a cooling fan/ a heater
Food-grade Sensor Probe 
Cozy Temperature, Happy Reptiles 
Seedlings thrive with precision
1 HOME BREWING
2 INDOOR CLIMATE CONTROL
3 SOUS VIDE
4 REPTILE
5 SEED GERMINATION
ONE OR TWO OUTLETS?
Most users don’t need heating & cooling in one project. With the WH2408, simply set ON and OFF—no unnecessary complexity, just plug and play!
REPLACEABLE PROBE, LONGER LIFE
As a consumable component, the replaceable probe helps extend the product’s lifespan by allowing easy replacement when needed. Find it in our store.
SET UP OF A DIFFERENT MODEL
Tired of flipping through the manual just to decode every setting? Try our WH2408 controller—intuitively designed for effortless setup in seconds!
EASY DIAL, SET IN SECONDS!
With the WH2408 controller, no complex parameters or confusing steps—just quick, hassle-free setup.
1 ONE WH2408 CONTROLLER
2 MULTIPLE PURPOSE
3 Not Working? Not a Bug!
IN WHAT CASE SHOULD I USE TWO CONTROLLERS? 
Scenario 1: Day-Night Temperature Fluctuations
For environments with signifcant day-night temperature changes use one WH2408 controller to manage a heating device (for instance, turn-on at 65°F , turn-off at 65.5°F) and another to control a cooling device ( for instance, turn-on at 80.5°F, turn-off at 80°F).
This setup ensures precise, energy-efficient control by activating devices only when the temperature moves outside the ideal range of 65°F to 80°F.
Scenario 2: Minimizing Temperature Overshoot
For applications requiring tighter temperature control, use one WH2408 to manage a heating device (for instance,turn-on at 90°F,turn-off at 95°F) and another to control a cooling device ( for instance, turn-on at 95°F, turn-off at 90°F).
This dual controller setup compensates for thermal inertia, ensuring the temperature quickly returns to the set range when overshooting occurs due to high device power.
【Effortless Setup with Intuitive Design】 : WILLHI digital temperature-controlled outlet switch simplifies settings with two knobs for on/off temperature adjustments—no complicated menus. It provides precision within -58°F to 230°F (-50°C to 110°C), making it an ideal thermostat plug for various applications. By memorizing settings during power outages, it minimizes disruption, saves energy, and reduces setup time, providing a hassle-free user experience.
【Versatile Applications】: Designed for reptile tanks, terrarium heat lamps, aquariums, aquarium heaters, seedling heating mats, greenhouses, incubators, attic fans, chicken croops and smokehouses, WILLHI aquarium thermometer controller is also perfect for home brewing, sous vide cooking, fermentation, meat curing, and mushroom growing. The included food-grade probe can be used directly in food preparation. The thermostat’s ambient temperature range is -4°F to 140°F (-20°C to 60°C). The probe’s measuring temperature range is -58°F to 230°F (-50°C to 110°C). Length of the probe tip is approx 1-1/2 inches (4.2cm).
【Robust and Safe Construction】: Made with a fire-retardant ABS shell, WILLHI digital temperature controller ensures safety and durability with built-in power isolation to guard against electrical hazards.The shell is not waterproof, though its probe is. Please keep the device dry. Note: Do not use the probe in salt water for extended periods- this will reduce its lifespan. For salt water applications, search “willhi Saltwater-Proof Probe for Aquarium” for a suitable replacement.
【Customizable and Reliable Features】: Offers heating and cooling modes, adjustable brightness, and both Fahrenheit and Celsius options. Its resettable fuse, ETL-certified power cord, and premium relay provide dependable performance, making it a standout thermostat plug.
【Powerful Performance with Patent-Pending Design】: WILLHI WH2408 digital temperature-controlled outlet switch is rated for up to 1200W (120V), with a 0.1°F control resolution for precise adjustments. Its innovative design is currently patent pending, setting a new standard for thermometer controllers. Package contains 1x WH2408 temperature controller, 1x sensor probe and 1x user manual. Package size(1 Pack): 6.6 x 3.6 x 3.6 inch (16. 7 x 9.1 x 9.1 cm)
