No accuracy requirement or spec is shown for the project so I guess any old opamp will work, right? it’s 59.16mV / pH step at 25degrees C for these sensors, so an input offset voltage of just ...

Modern fluorometric pH sensors are based on small organic molecules. Typically, they are very sensitive and are able to detect the desired analyte in very low concentrations, up to nanoconcentrations.

The sensor works by capturing trace amounts of sweat from your pores using “microfluidic technology.” You stick the sensor on your inner arm and leave it for 5-15 minutes—just long enough ...