Wireless thermometer and hygrometer ENGEL with external sensor

Specifications:

Transmission frequency: 433MHz

Temperature measurement
Ambient temperature: -9.9 ° C to + 60 ° C
Inside the refrigerator: -40 ° C to + 60 ° C
Possible transmission deviation: +/- 1%
Internal humidity measuring range: 10-99%
Accuracy of humidity measurement: + -3%
Transmitter Range: Maximum 100m (in open area)

Alkaline batteries *:
Remote sensor: 1xAA, 1.5V
Thermometer: 1xAA, 1.5V
Digital thermometer dimensions h / w / d: 86x77x22 mm
Remote sensor dimensions h / w / d: 41x64x20 mm 

Wireless digital thermometer ENGEL measures ambient temperature and temperature and humidity inside the refrigerator. Temperature and humidity in the refrigerator is recorded by the remote sensor inside the box wich is sending information in to the digital display of the outdoor unit. The digital display includes a clock and a record of minimum and maximum temperature. The maximum range of the remote sensor signal is 100m in free space at a transmission frequency of 433 MHz.

The following table shows the signal loss in comparison with the transmission medium. Each "wall" or obstacle reduces the transmission range according to the factor below.

Obstacle Reduce RF signal strength
Glass 5-15%
Plastics 10-15%
Wood 10-40%
Brick 10-40%
Concrete 40-80% 

* Batteries are not included