I have an IET DE-5000. Perfect meter, I use it e very day. Still spot on.
For serious work I have an Ex-GR standardslab GR-1620 bridge. It has aF resolution. Also some GR, Philips and HP standards
I build a fF meter just for the kicks. see:
http://www.pa4tim.nl/?p=2929For small inductors a Boonton 63H with pH resolution.
For a wider range or hard to measure components a GR-1608 these are almost bizar accurate.
When frequency plays a roll I use a VNA (or GR-1603)
Just for fun I have a Tek 130
I have some more bridges. (HP, WK, GR, ESI) Good labgrade bridges are very accurate and if not messed up by a former owner they stay very accurate. The downside is their size and weight. Some need a separate detector and gernerator.
And they are not beginner friendly. Most tools like this are made for lab use by a user with a sound knowledge about what he wants to measure and how to do that.
If you think ESR is measured at 100kHz and you want to measure the ESR of very small caps. you are not the bridge user the manufacturer had in mind
Measuring inductors is difficult because of many many reasons.
Most important, why do you want to measure so accurate. Most times if I need to measure pF or nH it is RF and then I measure at the frequency I need that capacitance or inductance (for instance in filters) Measuring at the extremes, there are many traps.