1. Introduction and Overview
The TROTEC BZ05 Indoor Thermohygrometer is a compact and versatile device designed to monitor indoor climate conditions. It provides accurate readings of temperature and relative humidity, along with time display and alarm functions, making it suitable for various environments such as homes, offices, and wellness areas.

Figure 1.1: Front view of the TROTEC BZ05 Indoor Thermohygrometer. The device features a clear LCD screen showing the current time (12:38 AM), temperature (21.6°C), and relative humidity (53%). Below the display are three control buttons: MODE, ADJ, and MEMO.
2. Product Features
The BZ05 offers a range of features to help you maintain a comfortable and healthy indoor environment:
- Accurate Measurement: Provides precise readings for indoor temperature and relative humidity.
- Time Display & Alarm: Functions as an alarm clock with time display.
- Comfort Level Indicator: A visual indicator (smiley face) to show if the climate is within a comfortable range.
- Min/Max Value Display: Records and displays the minimum and maximum temperature and humidity values over a period.
- Compact Design: Small and lightweight, suitable for desk placement or wall mounting.
- Battery Operated: Powered by 1x AAA battery (included).

Figure 2.1: Visual representation of the BZ05's key features. Icons indicate Relative Humidity, Min/Max value indication, 1x 1.5V AAA Batteries, LCD Display, and Time display.
3. Setup
3.1 Unpacking
Carefully remove the device from its packaging. Ensure all components are present:
- TROTEC BZ05 Thermohygrometer
- 1x AAA Battery
- User Manual (this document)
3.2 Battery Installation
- Locate the battery compartment on the back of the device.
- Slide open the battery compartment cover.
- Insert one AAA battery, ensuring the correct polarity (+/-) as indicated inside the compartment.
- Close the battery compartment cover securely.

Figure 3.1: Rear view of the BZ05 device. This image highlights the battery compartment, the 'RESET' button, and the '°C/°F' switch. A diagram of a 1.5V AAA battery is shown next to the compartment, indicating its type and quantity required.
3.3 Placement
The BZ05 can be placed on a flat surface using its integrated kickstand or mounted on a wall.
- Desk Placement: Extend the kickstand on the back of the device to stand it upright on a desk or shelf.
- Wall Mounting: Use a small screw (not included) to hang the device from the keyhole slot on its back. Ensure the mounting location is stable and away from direct sunlight, drafts, or heat sources for accurate readings.

Figure 3.2: Angled view of the BZ05, demonstrating its ability to stand upright using a built-in kickstand. This allows for convenient placement on desks or shelves.

Figure 3.3: The BZ05 device shown mounted on a wall in a modern living space, illustrating its versatility in placement. An icon for relative humidity is overlaid, emphasizing its primary function.
4. Operating Instructions
4.1 Button Functions
The device has three control buttons on the front:
- MODE: Switches between time display, alarm setting, and other modes.
- ADJ (Adjust): Used to adjust values (e.g., time, alarm) in setting modes.
- MEMO (Memory): Displays minimum and maximum recorded values for temperature and humidity.
4.2 Setting Time and Date
- Press the MODE button repeatedly until the time display flashes.
- Use the ADJ button to set the hour.
- Press MODE again to move to minutes, then use ADJ to set.
- Continue pressing MODE to cycle through year, month, and day settings, adjusting each with the ADJ button.
- Once all settings are complete, press MODE to exit setting mode.
4.3 Setting the Alarm
- Press the MODE button until the alarm time display appears (usually indicated by an alarm icon).
- Press and hold MODE until the alarm hour flashes.
- Use the ADJ button to set the desired alarm hour.
- Press MODE again to move to alarm minutes, then use ADJ to set.
- Press MODE to confirm and exit alarm setting.
- To activate/deactivate the alarm, press ADJ while in alarm display mode. An alarm icon will appear/disappear.
4.4 Viewing Min/Max Values
The device automatically records the minimum and maximum temperature and humidity values since the last reset.
- Press the MEMO button once to display the maximum recorded values.
- Press MEMO again to display the minimum recorded values.
- Press MEMO a third time to return to current readings.
- To clear the Min/Max memory, press and hold the MEMO button while the Min/Max values are displayed.
4.5 Switching Temperature Units (°C/°F)
On the back of the device, there is a small switch or button labeled °C/°F. Toggle this to switch between Celsius and Fahrenheit temperature units.

Figure 4.1: Rear view of the BZ05, highlighting the '°C/°F' switch located near the battery compartment. This switch allows users to easily toggle between Celsius and Fahrenheit temperature readings.
5. Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Battery Replacement: Replace the AAA battery when the display becomes dim or the device stops functioning. Always dispose of used batteries responsibly.
- Storage: If storing the device for an extended period, remove the battery to prevent leakage. Store in a cool, dry place.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Low or dead battery. | Replace the AAA battery. Ensure correct polarity. |
| Incorrect temperature/humidity readings. | Device placed near heat sources, drafts, or direct sunlight. | Relocate the device to a stable environment away from extreme conditions. |
| Buttons are unresponsive. | Temporary software glitch. | Remove and reinsert the battery. Use the 'RESET' button on the back if available. |
| Alarm does not sound. | Alarm is not activated or volume is too low (if adjustable). | Ensure the alarm icon is displayed. Check alarm settings. (Note: BZ05 has a fixed alarm sound). |
7. Specifications
| Parameter | Value |
|---|---|
| Model Number | 3510205010 |
| Dimensions (L x W x H) | 10.8 x 1.5 x 6 cm |
| Weight | 74 g |
| Power Supply | 1x AAA battery (included) |
| Temperature Measurement Range | 32°F to 50°C (0°C to 50°C) |
| Temperature Accuracy | ±1 °C |
| Humidity Measurement Range | 10-90% RH |
| Mounting Type | Wall Mount / Desk Stand |
| Color | Black |
| Country of Origin | Spain |
| First Available Date | May 16, 2011 |

Figure 7.1: Side profile of the BZ05, illustrating its compact dimensions: 108 mm in height, 60 mm in width, and 15 mm in depth.
8. Warranty and Support
For warranty information and technical support, please refer to the official TROTEC website or contact their customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.
Manufacturer: TROTEC
Website: www.trotec.com (Example link, please verify official website)