Firmware revision upadates:- Version 1.1.5 added a bug fix, that includes:- -Fixed autoscale issue introduced in version 1.1.3 Version 1.1.3 added bug fixes which included:- -Fixed false spike display on screen when power on, changing of volt/div or coupling setting, switching to SCOPE mode for other measurement modes. -Removed 500 ms interval setting from Data Logger function. Version 1.1.1 was a maintenance release which fixed number of firmware defects in the product. These fixes included:- -Waveform auto erase issue solved -Incomplete help file issue for Japanese version solved -Data logging issue solved -Utility display issue solved -Ability to change the first two alphabet of the Serial Number Original firmware version: 1.0.1