Skip to main content

Send Us a Message

Search

Active Air Indoor-Outdoor Thermometer w/Hygrometer

$25.19 USD
  • 3-meter remote probe for localized temperature monitoring.
  • Records minimum and maximum values for both temperature and humidity.
  • 1-year warranty against defects in materials and workmanship
  • View More Details

Earn 9 points for shopping and get $0.09 off your next order. Join Harvest Club for free.

Questions? Talk to a specialist. Mon–Fri, 9am–5pm PST
Free Shipping On Most Items* To the lower 48
Transparent Pricing Backed w/ price match guarantee
4.8/5 Rating 1935+ verified reviews
Secure Checkout SSL encrypted payments

Send Us a Message

VOLUME PRICING

Commercial & Bulk Purchasing

We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.

Commercial Inquiry

Contact Information
THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are adding monitoring to your grow tent because your plants show stress symptoms that vary based on environmental changes.
  • You are centralizing your climate tracking because juggling multiple handheld units creates clutter and makes data logging a chore.

What We Found

  • The 3-meter probe length is enough to reach the back of most 4x4 tents while the screen stays on the exterior wall.
  • The memory function stays accurate throughout the night, which saves you from manual checks during lights-off periods.

What Users Say

  • Growers who run high-heat lighting say they caught temperature spikes early by using the max and min memory feature.
  • Users tracking multiple rooms report that the clear, large display allows them to verify conditions from across the aisle.

Active Air Indoor-Outdoor Thermometer w/Hygrometer

Managing two environmental zones — a grow tent and the surrounding room, or two separate grow spaces — typically means two separate meters. The Active Air Indoor-Outdoor Thermometer w/Hygrometer consolidates both into a single compact unit, using a 3-meter remote probe to capture temperature in one location while the onboard sensor monitors the immediate environment. Pairing this monitoring tool with an Active Air 10" Inline Duct Fan - 760 CFM ensures you can act on the temperature data by exhausting excess heat from the tent. Current temperature and humidity display simultaneously, with Max and Min memory recording the extreme values for both metrics so you can review overnight or lights-off conditions without being present.

Built from sturdy materials suited to the demands of a grow room environment, the unit adds an alarm clock function with both 12-hour and 24-hour modes — a practical addition for growers managing timed feeding, lighting checks, or harvest schedules. The large display keeps all readings readable at a glance, and at under 0.3 lbs, it's light enough to move wherever your monitoring needs take it. For growers also monitoring root zone conditions, this device complements the Active Air 3-Way Meter for a comprehensive environmental overview.

Features

🌡️
Dual-Zone Temperature Monitoring

Monitors two temperature locations simultaneously — the onboard sensor covers the immediate area while the 3-meter remote probe reaches a tent interior, canopy level, or separate room.

💧
Onboard Humidity Sensor

Relative humidity sensor is built into the side of the unit for continuous indoor RH monitoring alongside temperature — no separate hygrometer needed. It provides the data necessary to determine if you need to activate an Active Air Commercial Humidifier - 75 Pint to increase moisture levels.

📏
3-Meter Remote Probe

The 3-meter temperature probe reaches into grow tents, behind equipment, or into adjacent spaces while keeping the display unit in a convenient, visible location.

📊
Max & Min Memory

Records high and low points for both temperature and humidity, letting you review environmental extremes from lights-off periods or overnight without manual monitoring.

12/24-Hour Alarm Clock

Built-in alarm clock with selectable 12 or 24-hour display — useful for scheduled feeding reminders, lighting checks, or any time-sensitive grow room tasks.

🖥️
Large Display

Spacious screen displays current temperature and humidity readings in a large, easy-to-read format — all key data visible at a glance from across the room.

Specifications

Specification Value
Readings Temperature (indoor & outdoor), Relative Humidity
Humidity Sensor Location Side of unit (onboard)
Remote Probe Cable Length 3 meters (temperature only)
Memory Max & Min (temperature and humidity)
Alarm Clock 12-hour and 24-hour modes
Dimensions (Unit) 8.8" L × 3.8" W × 0.7" H
Shipping Weight 0.29 lbs.

Warranty

The Active Air Indoor-Outdoor Thermometer w/Hygrometer is backed by a 1-year manufacturer warranty against defects in materials and workmanship.

FAQ

What is the difference between this unit and the Active Air Hygro-Thermometer? +

Both units monitor temperature and humidity with a 3-meter remote probe and Max/Min memory. The Indoor-Outdoor Thermometer w/Hygrometer adds a built-in alarm clock function with 12/24-hour modes, making it the better choice if you want a single device that also handles grow room scheduling reminders. The Active Air Hygro-Thermometer focuses purely on environmental monitoring without the alarm feature.

Does the remote probe also measure humidity, or just temperature? +

The 3-meter remote probe measures temperature only. Humidity is measured by the onboard sensor located on the side of the unit. This means for humidity readings, the unit itself needs to be positioned in the zone you want to monitor — while the probe can independently capture temperature from a separate remote location.

How does the Max/Min memory help with grow room management? +

The Max/Min function records the highest and lowest values reached for both temperature and humidity since the last reset. This is invaluable for identifying overnight temperature drops during lights-off, humidity spikes after watering, or heat buildup during peak lighting hours — conditions you may not be present to observe in real time.

How do I use the alarm clock function? +

The alarm clock supports both 12-hour and 24-hour time formats. Setup and alarm programming instructions are covered in the included instruction manual, linked in the Support & Manuals section above. The alarm is useful for scheduling feeding intervals, reminding you to check on plants, or flagging the end of a treatment period.

Where should I position the unit and probe in my grow tent setup? +

A common configuration is to place the unit outside the tent — on a shelf or wall nearby — and route the 3-meter probe through a vent opening or Active Air Premium Ducting - 6" x 25' to sit at canopy level inside. This gives you canopy-level temperature from the probe and ambient room humidity and temperature from the onboard sensors, covering both zones without opening the tent for readings.

Can this thermometer be wall-mounted? +

At 0.7" depth and under 0.3 lbs, the unit is well suited for wall mounting in addition to freestanding use. Wall mounting keeps it at eye level in a fixed position, freeing up shelf and workspace while keeping environmental readings continuously visible. Refer to the instruction manual for mounting hardware details.

Happy To Help

Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

Why Trimleaf

Equipping home growers, craft producers, and commercial operations across North America since 2016.

10+
Years of Specialist Knowledge
4.8★
Over 1,900 Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock