Measuring an unknown capacitor with a [Tenma 72-960 LCR meter](http://datasheet.octopart.com/72-960-Tenma-datasheet-20064.pdf), I got 89 nF at both 1 kHz and 120 Hz, which I believe because I measured other known capacitors, too. Then I tried measuring with the resistance function, and it gave me:

* 180 kΩ at 1 kHz
* 1.5 MΩ at 120 Hz

But the reactance of an 89 nF capacitor is:

* 1.8 kΩ at 1 kHz
* 15 kΩ at 120 Hz

Also confirmed that in resistance mode, it measures 1 kΩ for a 1 kΩ resistor at both frequencies.

Why are the measured values off by exactly ×100? Am I misunderstanding what the LCR meter measures? (Is it magnitude of total impedance \$|Z| = \sqrt{R^2 + X^2}\$ or just the resistive component R in \$Z = R + jX\$?)

Update with some more measurements:

10 µF:

* 9.393 µF @ 1 kHz
* 9.71 µF @ 120 Hz
* 185 ohm @ 1 kHz (reactance is 16 ohm)
* 5.6 kΩ @ 120 Hz (reactance is 133 ohm)

680 nF:

* 683.5 nF @ 1 kHz
* 686 nF @ 120 Hz
* 63.22 kΩ @ 1 kHz (reactance is 234 ohm)
* cannot measure at 120 Hz (reactance is 1.9 kΩ)

So the exact ×100 numbers may just be a fluke.