The measurement range of the body temperature (“face” button) is between 34 and 42.5 °C (93.2/108.5 °F).
The measurement range of temperature of objects, liquids and surfaces (“home” button) is between 1 and 55°C (33.8/131.0°F).
Thermofocus can operate in rooms where the temperature is between 16 to 40 °C (60.8-104°F). It is possible to use the thermometer also in rooms where the  temperature is lower than 16C (60.8°F), although accuracy and the operating range are not guaranteed.