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Active Air hygro-thermometer with max/min display in blister packaging.

Active Air Hygro-Thermometer

Official Active Air Dealer Model: HGIOHTJ
$17.50 USD$12.87 USD$17.50 USD
 $17.50 USD
  • Jumbo LCD display reads clearly from across the room
  • 3-meter external sensor cable for precise canopy placement
  • 1-year manufacturer warranty against defects
  • 1-year warranty against defects
  • View More Details

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THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are adding localized monitoring because standard room sensors fail to capture the actual temperature at canopy height.
  • You are consolidating your equipment data because you are tired of manually checking multiple monitors across your room.

What We Found

  • The 3-meter probe length is enough to reach the canopy from outside a standard tent, which keeps the display dry.
  • We recommend this for users who want continuous, fixed numbers rather than bouncing back and forth between menus.

What Users Say

  • Growers who placed the probe at the plant tops say they stopped guessing why their leaves were curling from heat.
  • Users tracking their drying space say the max and min memory feature is helpful for verifying overnight cooling trends.

Active Air Hygro-Thermometer

Knowing your temperature and humidity at a glance — without walking across the room or squinting at a small display — makes a real difference during a grow. The Active Air Hygro-Thermometer delivers both readings simultaneously on a jumbo LCD screen large enough to read from across your workspace, making it an excellent companion to other essential monitoring tools like the Active Air 3-Way Meter. The included 3-meter external sensor lets you position the probe exactly where it matters most: at canopy level, inside a tent, or in a remote corner — while the display stays wherever is most convenient for you.

The unit monitors both indoor and outdoor conditions with automatic display switching between the two, tracks Max and Min memory for historical high and low values, and provides continuous relative humidity and temperature readings without manual cycling between modes. Lightweight and versatile, it can be propped on a shelf, set on a workspace, or wall-mounted for hands-free monitoring throughout your grow cycle.

Features

🖥️
Jumbo LCD Display

Large-number screen is readable from a distance, letting you check conditions at a glance without stopping what you're doing in the grow room.

🌡️
Simultaneous Temp & Humidity

Displays current temperature and relative humidity at the same time — no toggling between readings to get a complete picture of your environment.

🔁
Indoor & Outdoor Monitoring

Auto-switches between indoor and outdoor temperature readings, making it easy to monitor two zones — such as inside a tent and in the ambient room — from one unit.

📏
3-Meter External Sensor

The 3-meter temperature probe reaches canopy level, grow tent interiors, or any remote location while keeping the display within easy view.

📊
Max & Min Memory

Records and displays the highest and lowest readings captured since last reset, so you can identify overnight temperature drops or humidity spikes without being present.

📌
Flexible Mounting Options

Prop it on a surface, place it on a workspace, or wall-mount it for hands-free monitoring — adaptable to any grow room layout or workflow.

Specifications

Specification Value
Display Jumbo LCD
Sensor Cable Length 3 meters
Readings Temperature, Relative Humidity (simultaneous)
Memory Max & Min
Monitoring Zones Indoor & Outdoor (auto-switch)
Mounting Freestanding or wall-mount
Dimensions (Unit) 9.0" L × 5.0" W × 1.3" H
Shipping Weight 0.25 lbs.

FAQ

What is the 3-meter sensor used for? +

The 3-meter external probe allows you to place the temperature sensor exactly where you need accurate readings — at canopy level inside a grow tent, near a root zone, or in a separate room — while keeping the display unit in a visible, convenient location. This is particularly useful when monitoring conditions inside a sealed tent equipped with an Active Air 6 inch Inline Duct Fan from the outside.

What does the Max/Min memory function record? +

The Max/Min memory stores the highest and lowest temperature and humidity readings captured since the last manual reset. This lets you review environmental extremes without being present — critical for catching humidity spikes that indicate you may need to deploy an Active Air Dehumidifier - 110 Pint to protect your plants.

How does the indoor/outdoor switching work? +

The unit auto-switches its display between indoor and outdoor temperature readings — effectively letting you monitor two separate zones simultaneously using the built-in sensor (indoor) and the 3-meter external probe (outdoor or remote). This makes it easy to compare conditions inside a grow tent against the ambient room without a second device.

Can this unit be wall-mounted? +

Yes — the hygro-thermometer supports wall mounting for hands-free placement, similar to how you would position an Active Air 16 inch Wall Mount Fan to maximize vertical space. Wall mounting keeps your workspace clear while maintaining constant visibility of your readings.

Does the unit display both Fahrenheit and Celsius? +

Please refer to the included instruction manual (linked above) for full details on temperature unit selection. Most hygro-thermometers in this category offer a toggle between °F and °C — the manual will confirm the exact method for switching display units on this model.

What batteries does the Active Air Hygro-Thermometer use? +

Battery type and quantity are detailed in the instruction manual linked in the Support & Manuals section above. At 0.25 lbs shipping weight, the unit takes standard small-format batteries — consult the manual for the exact specification before your first setup.

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