When you load a saved meter group, an indicator will appear next to the meter group name, indicating which slot the meter group was loaded from, and whether the meter group has been modified since it was loaded.
Some text fields in RSMM GUIs now have auto-complete. Auto-complete suggestions typically appear in a menu below the text fields, which can be navigated with the arrow keys. Pressing tab or return will insert the selected suggestion into the text field.
This GUI has been tweaked to make it less confusing to use.
Behavior of the "Column Width" and "Row Height" options has been overhauled, and a "Cell Scale" option was added. The sizing and scaling of the timeline is now better behaved, and less prone to graphical errors.
All text displayed in RSMM GUIs, as well as command feedback and RSMM-related system messages and action bar messages, is now localized. As of this update the only translations are for English (US), but translations for other languages are welcome.
RSMM for Minecraft 1.10 and older is now compatible with the Legacy Observers mod.
The following bugs were fixed:

A Fabric port of NarcolepticFrog's Redstone Multimeter mod