Hygrometer Thermometer GreenBlue GB540 — indoor 0–50°C / outdoor -20–65°C, DCF clock, outdoor sensor 60 m, black

The Greenblue 60133 Black is a combined hygrometer and thermometer designed for monitoring indoor and outdoor humidity and temperature. The unit provides separate measurement ranges for outdoor and indoor temperature, shows trends for both humidity and temperature, and integrates clock and alarm functions. The compact black housing measures approximately 160 mm wide, 35 mm deep and 115 mm high and is powered by standard LR6 (AA) batteries, allowing flexible placement in living spaces, work areas or near entry points.

Advantages

The device displays current indoor and outdoor temperature and relative humidity with trend indicators to show rising or falling values. Built-in clock and alarm functions add utility beyond basic environmental readings. The unit uses common AA batteries and has a compact profile that fits on shelves or can be positioned on tabletops. The black finish provides a neutral appearance suitable for most interiors.

Suitable for (tasks / use cases)

• Monitoring room humidity and temperature in living rooms, bedrooms and offices
• Tracking outdoor temperature near windows, balconies or entrances
• Using trend information to assess changes in indoor climate for HVAC adjustments
• Keeping a simple clock and alarm in the same compact device

Key specifications

• Outdoor temperature measurement range: -20 to 65 °C
• Indoor temperature measurement range: 0 to 50 °C
• Built-in display for simultaneous readings
• Trend display for hygrometer and thermometer readings
• Clock and alarm functions integrated
• Power supply: LR6 (AA) batteries
• Product colour: Black
• Approximate dimensions: 160 mm (W) × 35 mm (D) × 115 mm (H)

How to use

Install LR6 (AA) batteries in the battery compartment following polarity markings. Place the main unit indoors on a stable surface or mount it according to the manufacturer’s instructions if wall placement is required. Position the outdoor sensor or the unit where it can measure exterior conditions without direct exposure to rain or intense sunlight. Read the display for current indoor and outdoor temperature and humidity values; observe trend indicators to understand recent changes. Set the clock and alarm using the device controls to enable timekeeping functions.

Recommendations

For accurate readings, avoid placing the device near heat sources, air vents or in direct sunlight. Replace batteries promptly when low to maintain display and trend functions. Use the trend indicators together with regular checks to determine whether ventilation, heating or humidification is required.