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The 470 is 470 pF if that's all the marking. Sometimes they use the 3 digit code, which would make it 47 pF but if so there will be a letter suffix indicating the tolerance, K for 10% and M for 20%, but usually even then it's still pF. There is no real standard so you will have to guess. Or, heretical me, measure it.
If you don't have a measuring device, get one, or make one. Simple to do.
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