Kestrel Instruments Support & FAQs

Why is the unit flashing “E1” or "E2"?

This means the humidity sensor needs to be recalibrated. If the unit is less than 12 months old (from the date of purchase), send it back to NK for recalibration under warranty. If the unit is more than 12 months old, it can be returned to NK for recalibration for $40 plus shipping, or can be calibrated in the field using the NK RH Calibration Kit.