Sper Scientific 840034 Psychrometer - Anemometer - Manual (Page 18)

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ERROR CODES
E1 The probe is disconnected or damaged
E2 Below measuring range; calibrate the meter.
E3 Above measuring range; calibrate the meter.
E4 The original data is in error—Value error.
E5 Out of meter display range.
E6 The value is not calculated completely.
E11 Humidity calibration error.