Introduction
This manual provides instructions for the setup, operation, and maintenance of your Homedics HM100 Indoor Humidity Monitor. This device is designed to display indoor humidity and temperature, helping you maintain a comfortable indoor environment.
Package Contents
- (1) Homedics HM100 Indoor Humidity Monitor
Product Features
- Digital humidity gauge: Monitors indoor air humidity between 1% - 95% RH.
- Temperature display: Shows indoor temperature between 32°F - 122°F (0°C - 50°C).
- Min/Max records: Displays minimum and maximum humidity and temperature readings.
- Humidity comfort indicator: An icon visually represents the current humidity comfort level (low, OK, or high).
- Switchable units: Easily switch between Fahrenheit (°F) and Celsius (°C).
- Large, easy-to-read numbers.
- Freestanding design for tabletop, shelf, or counter placement.
- Compact and portable design (3 x 1.5 x 4.2 inches).
- Battery-operated: Requires 2 "AAA" batteries (not included).
Setup
- Insert Batteries:
Locate the battery compartment on the back of the unit. Insert 2 "AAA" batteries, ensuring correct polarity (+/-). Close the battery compartment cover securely.

Image: Rear view of the Homedics HM100 Indoor Humidity Monitor, highlighting the battery compartment. The compartment is typically located on the back panel and requires two AAA batteries for operation.
- Placement:
Place the monitor on a flat, stable surface such as a tabletop, shelf, or counter. Ensure it is not exposed to direct sunlight, heat sources, or areas with extreme drafts, as these can affect accuracy.

Image: The Homedics HM100 Indoor Humidity Monitor displayed on a wooden coffee table in a living room setting, demonstrating its freestanding design and suitability for various indoor placements.
Operating Instructions
Understanding the Display

Image: A detailed view of the Homedics HM100 display, showing current humidity (29%), temperature (71.6°F), and the minimum/maximum recorded values for both humidity and temperature. A comfort indicator icon is also visible.
- Current Humidity: Large numbers at the top display the current relative humidity (RH) percentage.
- Current Temperature: Large numbers at the bottom display the current temperature in Fahrenheit or Celsius.
- MIN/MAX Humidity: Shows the lowest and highest humidity recorded since the last reset.
- MIN/MAX Temperature: Shows the lowest and highest temperature recorded since the last reset.
- Humidity Comfort Indicator: An icon (e.g., a house with a "LOW", "OK", or "HIGH" indicator) visually represents the current humidity comfort level.
Switching Temperature Units (°F/°C)
On the back of the unit, locate the °F/°C button. Press this button to toggle between Fahrenheit and Celsius temperature displays.
Resetting MIN/MAX Readings
To clear the recorded minimum and maximum humidity and temperature values, locate the "RESET" button on the back of the unit. Press this button to reset the readings.
Maintenance
- Cleaning: Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or immerse the unit in water.
- Battery Replacement: When the display dims or becomes unreadable, replace the 2 "AAA" batteries. Dispose of old batteries responsibly.
- Storage: If storing the unit for an extended period, remove the batteries to prevent leakage.
Troubleshooting
| Problem | Solution |
|---|---|
| No display or dim display. | Check battery polarity. Replace batteries with new "AAA" batteries. |
| Inaccurate readings. | Ensure the unit is not near heat sources, direct sunlight, or extreme drafts. Allow 30 minutes for readings to stabilize after initial setup or relocation. |
| Cannot switch temperature units. | Ensure the unit has power. Press the °F/°C button firmly. |
Specifications
| Feature | Detail |
|---|---|
| Model | HM100 (UHE-HM100) |
| Brand | Homedics |
| Humidity Range | 1% - 95% RH |
| Temperature Range | 32°F - 122°F (0°C - 50°C) |
| Temperature Accuracy | 0.5°F / 0.5°C (approximate) |
| Power Source | 2 x "AAA" batteries (not included) |
| Product Dimensions | 3" W x 1.5" D x 4.2" H |
| Item Weight | 3.38 ounces (0.1 Kilograms) |
Warranty and Support
For warranty information or product support, please refer to the documentation included with your purchase or visit the official Homedics website. Keep your purchase receipt as proof of purchase.
Manufacturer: Homedics
UPC: 031262106780