Firmware revision updates :-

Version 1.20
-	Initial release

Version 1.22 - fixes serveral issues present in the previous release.
-	Bug fix for Input impedance > 1000Mohm. Default input impedance is 10Mohm. When user selects 1000Mohm input impedance in setup menu, meter will switch to >1000Mohm input impedance.
-	Revised the Ampere calibration GAIN limit from 1.3 to 1.57.

Version 1.27
-	Update to fix bug - Readings intermittently dropped to zero during data logging.