1. Product Overview
The MESTEK TH10 is a high-precision digital temperature and humidity meter designed for accurate and quick environmental measurements. It integrates functions for ambient temperature, relative humidity, wet bulb temperature, and dew point temperature. Featuring a Swiss-made semiconductor sensor, this compact and portable device offers reliable performance across various applications.

Image: The MESTEK TH10 meter showing its multi-functional display for ambient temperature, relative humidity, wet bulb temperature, and dew point temperature.
Key Features:
- High-Precision Sensor: Utilizes an upgraded SHT30 semiconductor sensor from Switzerland for accurate and rapid measurements.
- Multi-functional: Measures ambient temperature, relative humidity, wet bulb temperature, and dew point temperature.
- Dual Display: Simultaneously shows humidity and temperature readings.
- User-Friendly: Features °C/°F unit conversion, LCD backlight, and low battery indicator.
- Durable Design: Ergonomic, double injection precision case with anti-dust, anti-skip, and anti-drop protection.
2. Setup
2.1 Battery Installation
- Locate the battery compartment on the back of the device.
- Use the provided screwdriver to open the battery compartment cover.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover and secure it with the screw.

Image: Rear view of the MESTEK TH10 meter indicating the battery compartment for two AAA batteries and overall dimensions.
2.2 Powering On/Off
- To power on, press and hold the Power button (⑂) for approximately one second. The LCD backlight will illuminate.
- To power off, press and hold the Power button (⑂) again for approximately one second.
3. Operating Instructions
3.1 Display Overview
The device features a backlit LCD that displays both humidity and temperature readings simultaneously. Indicators for Wet Bulb (WB), Dew Point (DP), Relative Humidity (%RH), and temperature units (°C/°F) are clearly visible.

Image: Close-up of the MESTEK TH10's backlit dual display, showing both humidity and temperature readings for clear visibility.
3.2 Unit Conversion (°C/°F)
- While the device is on, press and hold the SEL button for a few seconds to switch between Celsius (°C) and Fahrenheit (°F) temperature units.

Image: The MESTEK TH10 demonstrating the unit switch function, converting temperature readings between Celsius and Fahrenheit by pressing the 'SEL' button.
3.3 Measurement Mode Selection
- Short press the SEL button to cycle through the different measurement modes: Ambient Temperature/Relative Humidity, Dew Point Temperature (DP), and Wet Bulb Temperature (WB).
- The active mode (DP or WB) will be indicated on the display.
Video: This video demonstrates the operation of the MESTEK TH10 Temperature and Humidity Meter, including powering on, switching between Celsius and Fahrenheit, and cycling through Dew Point and Wet Bulb measurement modes in various environments like a greenhouse, warehouse, and machine room.
4. Maintenance
4.1 Cleaning
- Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Keep the sensor probe free from dust and debris to ensure accurate readings.
4.2 Battery Replacement
- When the low battery indicator appears on the display, replace the batteries as described in the 'Battery Installation' section.
- Always use fresh AAA alkaline batteries.
4.3 Storage
- Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Remove batteries if the device will not be used for an extended period to prevent leakage.
5. Troubleshooting
5.1 Inaccurate Readings
- Check Sensor: Ensure the sensor probe is clean and unobstructed.
- Allow Stabilization: Temperature and humidity readings may take a minute or two to stabilize, especially after moving the device between environments with significant differences.
- Environmental Factors: Avoid placing the device near heat sources, direct sunlight, or strong air currents that could affect readings.
5.2 No Power/Display Issues
- Check Batteries: Verify that batteries are correctly installed and have sufficient charge. Replace if necessary.
- Power Button: Ensure the power button is pressed and held for the required duration to turn the device on.
6. Specifications
| Specification | Value |
|---|---|
| Brand | MESTEK |
| Model Number | TH10 |
| Color | Blue |
| Item Weight | 130 Grams (4.6 ounces) |
| Product Dimensions | 6.61 x 1.69 x 0.98 inches |
| Power Source | Battery Powered |
| Batteries | 2 AAA batteries required (included) |
| Battery Cell Type | Alkaline |
| Operating Humidity | 0% - 99% RH |
| Temperature Range | -20℃ (-4℉) to 60℃ (140℉) |
| Dew Point Temperature Range | -50℃ (-58℉) to 60℃ (140℉) |
| Wet Bulb Temperature Range | -20℃ (-4℉) to 60℃ (140℉) |
| Measurement Accuracy | ±0.1 |
| Certification | CE |
| Special Features | High Accuracy |
7. Applications
The MESTEK TH10 is suitable for a wide range of applications where real-time environmental information is crucial:
- HVAC systems
- Industrial settings
- Agriculture (e.g., greenhouses)
- Meteorology
- Medicine and laboratories
- Warehouse management
- Wine cellars
- Machine rooms and data storerooms
- Food hygiene

Image: The MESTEK TH10 meter shown in different application scenarios, including a home, plant nursery, storage facility, and warehouse, highlighting its versatility.
8. Warranty and Support
MESTEK provides 36 months of after-sale service and lifetime technical support for the TH10 Temperature and Humidity Meter. For any inquiries or assistance, please refer to the contact information provided with your purchase or visit the official MESTEK website.





