iHealth PT3 - Possible reasons for invalid measurement

This screen means this measurement is invalid.

Possible reasons for measurement errors include:

1. Measurement distance is greater than 3cm (1.18in).
   Caution, do not keep the button pressed while approaching the thermometer from a distance of less than 3 cm. Place the thermometer at a distance from the forehead of less than 3 cm THEN press the button.
2. Environment temperature does not meet measurement requirements or there is an excessively high-temperature difference.
• Temperature: 15°C-40°C (59°F-104°F)
• Humidity: 15-85%RH
• Atmospheric pressure: 70~106kPa
3. Target temperature exceeds the measurement range (32°C to 42.9°C).