If your multimeter doesn’t measure capacitance or you want to have wide auto-range capacitance measurement capabilities then try this project. Capacitance meter measurement range is quite large (from 5pF up to 2600μF) and of course range is selected automatically.
This capacitance meter like others use charging time measurement technique (τ=RC). Circuit is really simple. There are three buttons used. Two of them are used to calibrate capacitance meter in order to remove stray capacitance. Third button is used to save calibration data to EEPROM memory. You can download assembly source code compile and burn to PIC16F873A microcontroller. I guess this is a nice tool that fits in to collection.