I have an idea, but I do not know if it's possible. ..... Could one program the firmware so that with a short pressure on a key (example Powerswitch) or pressing two buttons together at the same time, the display is frozen? A datahold function. If you press the button briefly again, the normal measuring mode will continue. This feature would be very helpful if the display is being photographed for sharing.
There is a screenshot feature in the EMF-390 by holding the 2 middle buttons. It will record a screen photo and will be saved and viewed in the unit. Can also be downloaded with the software. This is a good suggestion and might be added to the GMC-500/600 series.
Would this save only a single screen shot or three or five? What memory would hold this? Any chance of adding a Micro SDHC card slot to record data on the device and place in file that could be uploaded to analysis software as well as hold screen images?