Identifying Capacitors

8p2 = 8.2 pF

n51 = 0.51 nF

220 pF

180 pF

560 pF

82 pF

The three numbers form, let's say XYZ(J), means XY x {10^Z} pF, e.g. 560 = 56 pF, 561 = 560 pF, 562 = 5.6 nF etc.

Cheap digital multimeters don't usually measure capacitances in this range, but you can build capacitance meter easily, there's plenty of schematics on the internet, just google "capacitance meter schematics".

I found this page interesting, when I had similar problems.