I am looking into purchasing the Arduino Primo for my project because it has a built-in Wi-Fi module and operates at low voltage.
However, I will be connecting sensors to it and it doesn't say anywhere what the Analogue-Digital Converter resolution is.
I would like it to be 12-bit for my project so can someone please confirm what the resolution actually is.
Thank you 
Have you looked at the documentation on the product page?
Why not?
Yes I have.
It doesn't mention it anywhere
The Primo has 6 analog inputs, labeled A0 through A5, each of which provide up to 14 bits of resolution (i.e., 16384 different values). By default they measure from ground to 3.3 volts, though it is possible to change the upper end of their range using the analogReference() function
You're welcome.