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Wireless Thermometer RATIO


  • Wireless transmission of outdoor temperature
  • Indication of indoor temperature
  • Max.-min. values
  • Time and alarm
  • Expandable up to 3 transmitters

Item number:




Product specification

Always in the know with the temperature – with the "RATIO" wireless thermometer from TFA.
A separate wireless transmitter determines the outdoor temperature at the location; an internal sensor measures the indoor temperature.
Controlling the room temperature is an important factor for the creation of a comfortable and healthy living environment and it helps save energy. Even one degree of temperature reduction can save up to 6% on heating costs.
With the outdoor temperature, you get a reliable and important information for your home, garden, leisure and work.
In addition, the device has a memory for highest and lowest values and a display for the time.
Two more transmitters for temperature can be connected, thus allowing the monitoring of other rooms, e.g. in the nursery, bedroom, cellar or garage.


  • Wireless transmission of outdoor temperature via transmitter (max. 3)
  • Indication of indoor temperature
  • Max.-min. function
  • Clock

Product information for download:

Technical data

Measuring range temperature outdoor-40…+65°C (-40…+149°F)
Delivery contentsBase station, temperature transmitter, instruction manual
Radio-controlled clock defeatableYes
Maximum range100 m
Maximum amount of transmitters3
Transmitter included in delivery30.3163
Transmission frequency433 MHz
Measuring range temperature indoor0...+60°C (+32...+140°F)
ClockRadio-controlled clock
AssemblingTo be hung or freestanding
Power consumptionBatteries
Batteries2 x AA 1.5 V (base station), 2 x AAA 1.5 V (transmitter)
Batteries includedNo
Dimensions(L) 68 x (B) 29 (78) x (H) 113 mm
Weight91 g