I wonder if the ZY1275 has still been continued…
KM001 is a bit quirky to use, but the graphing is nice, mainly because it is configurable within the settings (1fps, 10fps, 50fps, 100fps).
The ZY1276 graphing screen is actually also configurable, BUT and it’s a big BUT you need to unplug the meter, go to Extended Settings mode (plug the ZY1276 to power source while holding down the button to get to the Extended Settings), then set the graphing rate. Then push the button to exit Extended Settings mode, then the graphing rate will be the one you set. Now if you want to change the graphing speed again, re-do the above procedure (unplug, hold down button, replug), which is very inconvenient when I just want to adjust graphing sample display rate. I hope a new firmware update will incorporate the feature to change the graphing speed within the graphing options screen, and not have to go thru “Extended Settings” mode.