Electronic environment thermometer tfa dostmann 30.1009 — indoor/outdoor, °C, 70×20×110 mm, white

Electronic environment thermometer tfa dostmann 30.1009 is a compact digital thermometer for monitoring indoor and outdoor temperature. The device displays temperature in °C and comes in a white plastic housing sized 70×20×110 mm. A wired waterproof sensor allows placement of the sensing element outside a window or in environments such as refrigerators, freezers or aquariums, while the main unit remains indoors for easy reading. The instrument also records maximum and minimum temperature values which can be reset manually, enabling observation of peak temperatures over a chosen period.

Advantages

This thermometer combines a clear digital display with a wired, waterproof sensor for flexible placement. Its compact dimensions and wall-mountable design make it unobtrusive in living spaces, balconies or light commercial areas. The max-min memory with manual reset provides simple monitoring of temperature extremes without additional equipment. The white plastic housing is easy to clean and suited to standard interior environments.

Suitable for

• Monitoring indoor room temperature in living rooms, bedrooms and offices
• Measuring outdoor temperature by routing the sensor cable through a window or opening
• Temperature control in refrigerators and freezers using the waterproof sensor
• Measuring aquarium water temperature where a wired waterproof probe is required

Key specifications

• Temperature unit: degrees Celsius (°C)
• Housing material: plastic
• Placement: wall-mountable or freestanding on flat surfaces
• Display type: digital
• Overall dimensions: 70 × 20 × 110 mm
• Sensor: wired waterproof external probe for ambient or liquid temperature
• Functionality: max-min memory with manual reset

How to use

Place the main unit indoors on a wall or flat surface where the display is easy to read. Route the sensor cable through a window or opening and position the waterproof probe at the desired outdoor location or inside refrigeration units or aquaria for liquid temperature measurement. Power the device according to the included instructions, wait for the reading to stabilize, and use the manual reset to clear max-min values when needed. Avoid exposing the main unit to prolonged direct sunlight or extreme humidity to maintain accuracy and longevity.

Usage recommendations

For accurate outdoor readings, place the probe in a shaded, well-ventilated spot away from radiating surfaces. When measuring refrigerators or freezers, position the probe away from direct contact with cooling elements to reflect typical internal temperatures. Regularly check the sensor cable for damage and reset the max-min memory after significant temperature changes to track new extremes.