Proform 850 dialing it in closer

This is the same one as me but in a fancy case........you might consider getting the 2 o2 canel one.
https://www.amazon.com/dp/B001QFL8KE/?tag=fabo03-20

Here is the one i have
Innovate LM-2 Digital Air/Fuel Ratio Meter Basic Kits 3837

Here is the dual o2 channel one on
https://www.amazon.com/dp/B001QFE018/?tag=fabo03-20