Introduction
Thank you for purchasing the LICHI LC801 Indoor Thermometer Hygrometer. This device is designed to accurately monitor indoor temperature and humidity, providing essential environmental data for your comfort and well-being. Please read this manual carefully before use to ensure proper operation and maintenance.

Image: Front view of the LICHI LC801 Indoor Thermometer Hygrometer, displaying temperature and humidity readings.
Package Contents
- 1 x LICHI LC801 Indoor Thermometer Hygrometer
- 1 x User Manual
- (Note: AAA batteries are required and not included)
Product Features
- High Precision Sensors: Accurately detects indoor temperature and relative humidity.
- Quick Refresh Rate: Data updates every 5 seconds.
- Large LCD Display: 4-inch screen with large digits for easy readability.
- Backlight Function: Illuminates the display for 10 seconds for reading in low light conditions.
- Comfort Indicator: Provides visual cues for indoor comfort levels (Dry, Comfort, Wet).
- Temperature Unit Switch: Easily switch between Celsius (°C) and Fahrenheit (°F).
- Max/Min Records: Stores all-time and 24-hour maximum and minimum temperature and humidity readings.
- Versatile Placement: Equipped with a foldable stand for tabletop use and a hanging loop for wall mounting.

Image: The LICHI LC801 device shown with callouts highlighting its key features such as backlight, humidity, temperature, air comfort indicator, low battery indicator, and °C/°F switcher.
Product Overview
The device features a clear LCD screen displaying current temperature, humidity, comfort level, and maximum/minimum records. On the back, you will find the battery compartment, a foldable stand, and buttons for operation.
- LCD Display: Shows all measurement data.
- Backlight Button (Top): Activates the backlight.
- °C/°F Button (Back): Toggles between Celsius and Fahrenheit.
- Clear Button (Back): Resets MAX/MIN records.
- Reset Button (Back): Resets the device to factory settings.
- Battery Compartment (Back): Holds 3 AAA batteries.
- Foldable Stand (Back): For tabletop placement.
- Hanging Loop (Back): For wall mounting.
Setup
- Install Batteries:
- Open the battery compartment cover on the back of the device.
- Insert 3 new AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover.
The device will power on automatically and begin displaying temperature and humidity readings.
- Initial Placement:
Place the device in your desired location. Allow a few minutes for the sensors to stabilize and provide accurate readings.
Operation
1. Reading the Display
The large LCD screen displays the current indoor temperature and humidity. The top section shows humidity percentage, and the bottom section shows temperature.
2. Switching Temperature Units (°C/°F)
Press the °C/°F button located on the back of the device to toggle between Celsius and Fahrenheit temperature units.
3. Backlight Function
Press the light bulb icon button on the top of the device to activate the backlight. The backlight will illuminate the screen for approximately 10 seconds, making it easier to read in dark environments.

Image: The LICHI LC801 display shown in both bright and dark environments, demonstrating the effectiveness of the backlight feature for readability.
4. Comfort Indicator
The display includes a comfort indicator (a smiley face icon) that visually represents the indoor comfort level based on humidity:
- Dry: Humidity Range < 40%
- Comfort: Humidity Range 40% ~ 70%
- Wet: Humidity Range > 70%

Image: A visual guide explaining the Air Comfort Indicator, showing "Dry," "Comfort," and "Wet" ranges with corresponding emoji icons.
5. Max/Min Records
The device automatically records the maximum and minimum temperature and humidity values over time. These values are displayed below the current readings.
- To view the maximum and minimum records for the last 24 hours, the device cycles through them automatically.
- To clear the recorded MAX/MIN values, press the Clear button on the back of the device.
Placement Options
The LICHI LC801 offers flexible placement options:
- Tabletop Placement: Extend the foldable stand on the back of the device to place it on any flat surface, such as a desk, shelf, or nightstand.
- Wall Mounting: Use the hanging loop located on the back of the device to mount it on a wall using a nail or screw (not included).

Image: The back of the LICHI LC801 device illustrating its two placement options: a loop for hanging on a wall and a foldable stand for tabletop use.
Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or immerse the device in water.
- Battery Replacement: When the low battery indicator appears on the display, replace all 3 AAA batteries with new ones to ensure accurate readings and continuous operation.
- Storage: If storing the device for an extended period, remove the batteries to prevent leakage.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display or faint display | Low or dead batteries; incorrect battery installation. | Replace batteries with new AAA batteries, ensuring correct polarity. |
| Inaccurate readings | Device placed near heat/cold sources or in direct sunlight; sensor obstruction. | Relocate the device to a stable indoor environment away from extreme temperatures or drafts. Ensure sensors are clear. |
| Backlight not working | Low batteries; button malfunction. | Replace batteries. If the issue persists, contact customer support. |
| Cannot switch °C/°F | Button malfunction. | Try pressing the button firmly. If unresponsive, contact customer support. |
Specifications
| Parameter | Value |
|---|---|
| Model Number | LC801 |
| Temperature Range | +14.2°F ~ +122°F (-9.9°C ~ +50°C) |
| Temperature Accuracy | +/-1°F (+/-0.5°C) |
| Humidity Range | 1% ~ 99% RH |
| Humidity Accuracy | +/-5% RH |
| Refresh Rate | Every 5 seconds |
| Power Source | 3 x AAA Batteries (not included) |
| Product Dimensions | 12.7 x 8.89 x 2.49 cm (5 x 3.5 x 0.98 inches) |
| Weight | 181 g (6.38 oz) |
| Display Type | LCD with Backlight |

Image: Diagram illustrating the dimensions of the LICHI LC801 Indoor Thermometer Hygrometer, showing its height, width, and screen size.
Warranty and Support
LICHI products are designed for reliability and performance. For any questions, technical support, or warranty inquiries, please refer to the contact information provided with your purchase or visit the official LICHI website. Please retain your proof of purchase for warranty claims.