Digital capacitance meter

Have you just invested in a large bag of capacitors with incomprehensible, little or no markings? Then read on. The instrument described here has five capacitance ranges covering a total range of 100 pF to 100 µF, can be powered from a single 9-V battery, and has a built-in over-range indicator to prevent ambiguous readings. So, build this capacitance meter before even opening your bag...