What type of capacitors have the least tolerance (precision) for low voltage (<16V) and in pF-nF range?

 

Here is a parameter search page. From this you can learn what kinds of capacitor have every kind of tolerance rating. I narrowed the answers down to less than 60,000.

http://www.mouser.com/Passive-Compo...zojhnZ1z0sq44Z1z0sq5vZ1z0t6feZ1z0srsyZ1z0t6fg

 

Look for a dielectric called either COG or NPO. I forget what they stand for but they have good initial tolerance and the least variation over temperature.

 

Hello,

I always have used polystyrene (styroflex , styrol) capacitors for stability.
Read more about them on this page of the "cap-site":
http://my.execpc.com/~endlr/film.html

Bertus