The LCR-Reader line has since expanded to include models such as the LCR-Reader R2, which features a 250 kHz test frequency ... titled "Calibration of Tweezer Meters Enabling Sub 1 pF and Sub ...

There are other options, of course. Among other things, you can now buy meters that have built-in tweezer probes. While not the first, the FNIRSI LCR-ST1 are affordable, and [TheHWcave] puts them ...