Firmware revision updates:- 2013-08-05 Version 2.26 fixed an issue present in the previous release. - Fix incorrect reading when the battery level is at = 4.7V. Wrong reading on the display may mislead users about the measurement made. - Fix datalogging memory retrieval problem. When log memory is full, it will not be able to retrieve previously logged data. - Fix inaccurate DC measurement when mixed signal (AC+DC) present. The factory default option is set to DC Filter ON during DC measurement. The DC Filter function attenuates AC signals to help you read the correct DC measurement from a mixed signal. Version 2.13 - Initial release