If you have one of those $5 (often free) Harbor Freight DMMs like I do, you can use it to estimate the capacitance of capacitors over 5µF or so.
By testing about a dozen capacitors I had laying around, I've found that mine has about 1.02MΩ of input resistance when set to the 20V scale. The math works out so that if you charge a cap and then measure the seconds it takes to fall from 10.00V to 3.75V, that is the capacitance in µF. You can use any two voltages you want as long as the lower one is 37.5% of the higher voltage.
Below 5µF, it's to hard to manually time it.
By testing about a dozen capacitors I had laying around, I've found that mine has about 1.02MΩ of input resistance when set to the 20V scale. The math works out so that if you charge a cap and then measure the seconds it takes to fall from 10.00V to 3.75V, that is the capacitance in µF. You can use any two voltages you want as long as the lower one is 37.5% of the higher voltage.
Below 5µF, it's to hard to manually time it.