The measuring range is quite large, from 5pF all the way to 2600uF. It is all taken care of by the PIC16F873A inside the circuit.
http://www.geocities.com/dariuskrail20/PICCapMeter.html
This is claimed as a very accurate and simplest LC inductance capacitance meter. It allows you to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance from 0.1pF up to 300nF.
http://electronics-diy.com/lc_meter.php
http://www.edn.com/article/CA196485.html
in picofarad range
http://www.e-insite.net/ednmag/archives/1997/090197/18di_04.htm
measuring admittance of an ac circuit that varies with level
http://www.omega.com/literature/transactions/volume4/T9904-13-RF-CAP.html
relies on a simple test circuit and the single-shot capture & measurement capabilities inherent in digital oscilloscopes
http://www.lecroy.com/tm/library/LABs/lab418/default.asp
http://my.integritynet.com.au/purdic/lc-meter-project.htm
http://www.web-ee.com/Schematics/Inductance Meter/Inductance Meter.htm