1. Introduction
The MESTEK TH11 is a high-precision digital temperature and humidity meter designed for accurate environmental monitoring. It combines functions for measuring ambient temperature, relative humidity, wet bulb temperature, and dew point temperature. This device features a Swiss-made semiconductor sensor for reliable and fast measurements, making it suitable for various applications including HVAC, industrial, agricultural, and domestic use.
2. What's in the Box
- 1 x MESTEK TH11 Digital Temperature Humidity Meter
- 3 x AAA Batteries
- 1 x Velvet Bag
- 1 x User Manual
- 1 x Screwdriver
Image: Package contents of the MESTEK TH11 meter.
3. Product Features
- High-Precision Sensor: Utilizes a semiconductor sensor from Switzerland for accurate and rapid measurements.
- Multi-functional Measurement: Measures ambient temperature, relative humidity, wet bulb temperature, and dew point temperature.
- Dual Display: Clear LCD backlight screen displays both humidity and temperature simultaneously.
- Measurement Ranges:
- Humidity: 0%~99%RH
- Ambient Temperature: -20°C~60°C (-4°F~140°F)
- Dew Point Temperature: -50°C~60°C (-58°F~140°F)
- Wet Bulb Temperature: -20°C~60°C (-4°F~140°F)
- User-Friendly Design: Features °C/°F unit conversion, low battery indicator, 30-minute auto shutdown (cancellable), MAX/MIN value display, and data hold functions.
- Durable Construction: Ergonomic design with double injection precision case, anti-dust, anti-slip, and anti-drop ABS material.
Image: Overview of the MESTEK TH11 meter and its multi-functional display.
Image: Detail of the SHT30 high-precision sensor.
4. Setup
4.1 Battery Installation
- Locate the battery compartment on the back of the device.
- Use the provided screwdriver to open the battery compartment cover.
- Insert three (3) AAA batteries, ensuring correct polarity (+/-).
- Replace the battery compartment cover and secure it with the screw.
4.2 Initial Power On
After installing the batteries, press the power button (Power Symbol) to turn on the device. The LCD screen will illuminate, displaying current temperature and humidity readings.
5. Operating Instructions
5.1 Power On/Off
- Press the Power Symbol button to turn the meter ON.
- Press and hold the Power Symbol button for approximately 2 seconds to turn the meter OFF.
5.2 Measurement Modes (DP/WB)
The MESTEK TH11 offers four professional measurement modes: ambient temperature, relative humidity, wet bulb temperature, and dew point temperature.
- Short press the DP/WB button to cycle through the display modes: Dew Point Temperature (DP), Wet Bulb Temperature (WB), and Ambient Temperature/Relative Humidity.
Video: Demonstrates how to select different measurement modes (Dew Point, Wet Bulb, Ambient Temperature/Humidity) using the DP/WB button on the MESTEK TH11 meter.
5.3 Unit Conversion (°C/°F)
- Long press the HOLD °C/°F button to switch between Celsius (°C) and Fahrenheit (°F) temperature units.
Image: Switching between Celsius and Fahrenheit temperature units.
5.4 Data Hold Function
- Short press the HOLD °C/°F button to freeze the current measurement data on the display. Press again to release the hold function.
5.5 MAX/MIN Value Display
- Short press the MIN/MAX button to view the maximum (MAX) or minimum (MIN) recorded values during the current measurement session. Press repeatedly to cycle between MAX, MIN, and current readings.
Image: Displaying MAX/MIN values.
5.6 Auto Shutdown
The device is equipped with a 30-minute auto shutdown feature to conserve battery life. This function can be canceled if continuous operation is required (refer to the full user manual for detailed instructions on disabling auto shutdown).
5.7 Low Battery Indicator
A low battery icon will appear on the LCD screen when the battery level is low. Replace the batteries promptly to ensure accurate measurements.
5.8 Measurement Considerations
To obtain stable and accurate readings, especially when moving the device between environments with different temperatures and humidity levels, allow approximately 20 minutes for the meter to adapt to the new conditions before taking measurements.
5.9 Tripod Mounting
The MESTEK TH11 includes a tripod hole for mounting, allowing for stable, hands-free measurements in various settings.
Image: Tripod mounting hole on the back of the device.
6. Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use for extended periods, remove the batteries to prevent leakage. Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.
- Sensor Care: Keep the sensor area clean and free from dust or debris to ensure accurate readings. Avoid touching the sensor directly.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Inaccurate readings | Device not acclimated to environment; dirty sensor; low battery. | Allow 20 minutes for acclimation; clean sensor; replace batteries. |
| Device does not power on | Dead or incorrectly installed batteries. | Check battery polarity; replace with fresh AAA batteries. |
| Display is dim or flickering | Low battery. | Replace batteries. |
| Auto shutdown occurs too quickly | Auto shutdown feature is active. | Refer to the full user manual for instructions on how to disable the auto shutdown function if continuous operation is needed. |
8. Specifications
| Parameter | Value |
|---|---|
| Brand | MESTEK |
| Model Number | TH11 |
| Color | Blue |
| Product Dimensions | 2.1"W x 7.4"H (54mm x 188mm) |
| Item Weight | 4.2 ounces (0.26 Pounds) |
| Battery Type | 3 x AAA Alkaline batteries (included) |
| Mounting Type | Tabletop, Tripod Mountable |
| Humidity Range | 0%~99%RH |
| Ambient Temperature Range | -20°C~60°C (-4°F~140°F) |
| Dew Point Temperature Range | -50°C~60°C (-58°F~140°F) |
| Wet Bulb Temperature Range | -20°C~60°C (-4°F~140°F) |
| Temperature Accuracy | ±1°C |
9. Warranty and Support
MESTEK provides a 36-month after-sale service and lifetime technical support for the TH11 Digital Temperature Humidity Meter. For any inquiries or assistance, please refer to the contact information provided in the full user manual or visit the official MESTEK brand store:
