Somewhere in the world there must be a bunch of scientists working to establish a more accurate value for the mass of the electron.
NIST publishes an updated value every 5 years, so I assume someone is doing the measuring.
This field is of great interest to me, as my hypothesis predicts a slowly drifting electron mass.
https://www.gammaspectacular.com/steven/volt_o_clock.php
If anyone happens to know someone directly or indirectly, I would love to have a contact.