Use and Care Manual

Error Message Displays
1. ER1: Relative Humidity measurement failure. Have the meter
repaired or replaced.
2. ER2: Internal temperature circuit failure. Have the meter repaired or
replaced.
3. ER3: Reference resistance failure. Have the meter repaired or
replaced.
4. ER4: Internal temperature sensor measurement is out of range.
Always measure within the published specified range.
5. ER5: External temperature sensor measurement is out of range.
Always measure within the specified range of the external
temperature sensor.