Digital Temperature & Humidity Controller STC-3028 – Dual Display Thermostat for Incubators, Greenhouses, Reptile Enclosures & Aquariums

The STC-3028 Digital Temperature & Humidity Controller is a high-precision, intelligent dual-display thermostat built for professional and hobby-grade environmental control. Whether you’re managing an incubator, greenhouse, reptile terrarium, mushroom farm, aquarium or a specialized lab/fermentation setup, this controller gives you the stability and reliability your system demands.

Why it stands out

• Dual-relay outputs enable simultaneous control of both heating/cooling and humidifying/dehumidifying systems — ensuring your setup keeps both temperature and humidity within the ideal window.
• A wide operating range of –20 °C to +80 °C for temperature and 0-100% RH for humidity allows extreme versatility from cold storage through to tropical environments. 
• Excellent precision: typical specification ±1 °C temperature accuracy and ±0.1% RH humidity accuracy.
• Clear dual LED display: red-for-temperature and blue-for-humidity, giving you at-a-glance monitoring of both parameters.
• Built-in 1-metre NTC (or equivalent) sensor probe for fast, stable measurement and easy installation. 
• Durable flame-retardant ABS housing plus compact form factor (≈ 75 × 34.5 × 85 mm) makes it panel-mount friendly and suitable for long-term duty. 
• Flexible power-supply options (AC 110-220 V, and in some versions 12/24 V) make it adaptable across many regions and systems. 

Key Features at a glance

• Dual Control Function: Independently set start-/stop values for both temperature and humidity to maintain exact conditions.
• Wide Range Compatibility: Temperature control from –20 °C to +80 °C; humidity from 0-100% RH.
• High Precision Readings: Up to ±1 °C for temperature and ±0.1% RH for humidity.
• Smart Dual Display: Two LED zones (red and blue) show live measurements side-by-side.
• Integrated Sensor Probe: 1-metre cable probe provides fast response and convenient placement.
• Versatile Input Voltage: AC 110-220 V (some DC 12/24-V variants) for global use.
• Durable & Compact Build: Flame-retardant ABS housing, compact size for panel mount or enclosure setup.

1. Applications — Where you can use it
   Ideal for any environment requiring tight climate control, including:
2. Poultry and reptile incubators — where precise temp/humidity drives hatch rates.
3. Greenhouses and hydroponics — ensuring optimum growth conditions for plants and mushrooms.
4. Aquariums and terrariums — maintaining stable aquatic and reptile habitats.
5. Mushroom farms and other fungal cultivation — where both thermal and moisture balance are crucial.
6. HVAC or ventilation systems and cold-storage units — for labs, research facilities or food storage.
7. Home-brewing and fermentation setups — where temp & humidity both influence yield and quality.

Operation & Setup — Easy for beginner and advanced users
The STC-3028 features intuitive controls:

1. To set the Start temperature or humidity: press and hold the ▲ (up) button for ~3 seconds, then use ▲/▼ to set the value.
2. To set the Stop value: press and hold the ▼ (down) button for ~3 seconds and then adjust.
3. Calibration mode: Press ▲ + ▼ together to calibrate sensor offset values for temperature or humidity (fine-tune to 0.1 units).
4. Factory reset: Hold ▲ + ▼ simultaneously for ~3 seconds to return to default settings.

These controls make it approachable even for first-time users, while offering enough precision for advanced setups.

Why choose this controller
With its dual-relay capability, broad operating range, robust design and clear display, the STC-3028 stands out among many single-parameter controllers. Many competing units offer only temperature control or humidity control — the dual control functionality makes this unit especially versatile and cost-effective for multi-parameter requirements. For example, one datasheet highlights the ability to “connect a humidifier and dehumidifier at the same time” alongside the heating/cooling load.