Outdoor Bimetallic Thermometer Terdens 990 — window/wall mount, analog temperature gauge

Terdens 990 is an outdoor bimetallic thermometer designed for window or wall mounting. The analog temperature gauge uses a bimetallic sensing element to indicate ambient outdoor temperature without requiring power or electronic components. Its mechanical construction provides a straightforward, low-maintenance way to monitor outdoor conditions at homes, balconies, greenhouses and sheds.

Advantages

The thermometer delivers continuous, passive temperature measurement with a clear analog dial that is easy to read at a glance. Its bimetallic mechanism is mechanically robust and not dependent on batteries or calibration software, reducing upkeep. The housing and mounting options allow secure installation on windows or walls, and the simple design tolerates typical outdoor exposure when installed in a sheltered location.

Suitable for

• Residential outdoor temperature monitoring on balconies and patios
• Greenhouses and cold frames where a simple temperature reference is needed
• Sheds, garages and workshops for basic ambient temperature awareness
• Window mounting to view outside temperature from indoors

Key specifications

• Measurement principle: bimetallic sensing element providing mechanical temperature indication
• Display type: analog dial with pointer
• Mounting options: designed for window or wall installation
• Power: passive, no batteries or external power required
• Intended use: outdoor ambient temperature measurement

How to use

Mount the device according to the chosen installation method: attach to a window frame or fix to an exterior wall at eye level for easiest reading. Avoid direct exposure to driving rain or direct sunlight that can cause localized heating and affect the reading; a sheltered position is preferable. Read the temperature on the analog dial pointer; the bimetallic element responds to ambient temperature changes and moves the pointer accordingly. No electrical connections or regular battery replacement are required; occasional cleaning of the housing and dial face will help maintain legibility.

Usage recommendations

For reliable readings, install the thermometer in a shaded, ventilated spot away from heat sources such as vents, heaters or reflected sunlight from windows or metal surfaces. Periodically check the mounting for security and clean the dial face gently to ensure clear visibility.