update Feb 2023
Wrote the tds-xiao.ino Total Disswolved Solids, sort of conductivity for sweat using the Seeeduino XIAO and the Gravity TDS it works, so making a case for it.
Started June 7th 2022
First, who are the main players in Na, K wearables, what labs which people?
Would any of them send a few wearables for a High School Robotics Machine Learning club to study?
https://news.berkeley.edu/2019/08/16/wearable-sensors-detect-whats-in-your-sweat/
ali javey
More research found June 2023
https://open.oregonstate.education/aandp/chapter/26-1-body-fluids-and-fluid-compartments/
https://lpi.oregonstate.edu/mic/minerals/sodium
https://www.nature.com/articles/s41598-022-20825-0
By Jeremy Ellis Twitter @rocksetta use this information at your own risk!