Check out the new screen that came with new firmware update for CCR Liberty. Everything you need to know to assess the health of your PPO2 measurement and sensors on one screen.
mV and PPO2 of O2 sensors, the indirect PPO2 measurement calculated from the He sensors right below, and the PO2 of your diluent flush on the bottom left.

Also a handy Deco screen (or multiple pages for some :) )