9This prompt appears for 1 second each time the instrument isturned on.The parameter code, “734f” for free chlorine or “734t” for totalchlorine, indicates that the meter is in a ready state and zeroingcan be performed.Sampling in Progress. This flashing prompt appears each time themeter is performing a measurement.This indicates that the meter is in a zeroed state and measurementcan be performed.Light over range: the cuvet is not inserted correctly and an excessambient light is reaching the detector. If the cover is properlyinstalled, then contact your dealer or the nearest Hanna CustomerService Center.The blinking "BAT" indicates that the battery voltage is getting lowand the battery needs to be replaced.This indicates that the battery is dead and must be replaced. Oncethis indication is displayed, the meter will lock up. Change thebattery and restart.“Configuration”: this indicates that the meter has lost itsconfiguration. Contact your dealer or the nearest Hanna CustomerService Center.CALIBRATION MODE MESSAGESThe date of the last calibration appears on the LCD each time thecalibration mode is entered. If calibration is performed for the firsttime, “F.CAL” appears.This indicates that the factory calibration is selected.GUIDE TO DISPLAY CODES