Bloom Works HTC-2 Digital Thermometer Hygrometer - Indoor Outdoor Temperature & Humidity Monitor with Clock Display

What does the Bloom Works HTC-2 Thermometer Hygrometer measure?

It monitors indoor temperature, indoor humidity (RH), and a second temperature via the wired external probe—great for checking conditions in two zones like inside and outside a tent or enclosure.

What are the temperature and humidity ranges?

The HTC-2 typically measures temperatures from -50°C to +70°C and humidity from 10% to 99% RH. Temperature accuracy is usually within ±1°C, and RH accuracy is around ±5%, which is suitable for grow rooms, enclosures, and household use.

Does the HTC-2 show min/max readings?

Yes—it tracks high and low readings for both temperature and humidity. Use the MIN/MAX button to cycle through values. Hold the same button to clear stored records and reset tracking.

Does the HTC-2 display time and other info?

Yes—it includes a digital clock with 12/24-hour formats, a simple calendar, °C/°F switching, and humidity comfort labels like DRY or WET. Many units also include a daily alarm and hourly chime.

What kind of battery does the HTC-2 use?

It runs on a single AAA battery. Some units include one in the box, but not always. Battery life is long due to low power draw. If the screen dims or readings look off, replace the battery first.

Does the HTC-2 need to be plugged in?

No—it’s completely battery-powered. No cords, outlets, or USB charging required. Just insert a battery and it’s ready to go.

Can the HTC-2 be mounted or freestanding?

Yes—you can mount it on a wall or use the fold-out stand to place it on a shelf or table. It’s ideal for rooms, greenhouses, grow tents, or enclosures.

Where should I place it for the best readings?

Place the probe at canopy height or near the target zone. Keep the main unit in an easy-to-read location, away from direct airflow, heat sources, or humidifier mist to avoid distorted readings.

What environments is the HTC-2 good for?

It works well in grow tents, greenhouses, drying rooms, propagation domes, reptile tanks, and even bedrooms or baby rooms. Keep the main unit dry and the probe shaded or protected if used outdoors.

Is the external probe waterproof?

The probe is fine in high humidity and light splashes but shouldn't be submerged or left in standing water. It's about 1.5 meters long—plenty for flexible placement in most setups.

How do I clean and care for the HTC-2?

Wipe the unit with a dry or slightly damp cloth—never soak or spray it. Clean the probe gently with a dry cloth. Keep it dry when not in use to extend sensor life.

How do I check if the humidity reading is accurate?

Use a basic “salt test” by sealing the unit in a container with a salt slurry (~75% RH target). This helps you find your unit’s offset. Most HTC-2 meters don’t allow calibration, but you can mentally adjust based on your known offset.

Why is the humidity or temperature reading off?

Sensor placement and environment matter. Avoid placing it near heaters, humidifiers, or lights. If readings seem stuck, remove the battery for 10 seconds, replace it, and let the unit stabilize in a neutral location.

Can I use the HTC-2 long-term in a humid tent or enclosure?

Yes—but keep it out of direct mist or water contact. High humidity may reduce sensor lifespan over time. Letting it dry out occasionally can help preserve accuracy.

What comes in the box, and how do I set it up?

You’ll get the main unit with an attached external temp probe. Some units include a AAA battery. To set up: insert the battery, set the time, place the unit and probe, and check min/max after a day to understand your environment.