Error percentage in volume measurement

1)Plz tell me the percentage error in volume measurement??
2) can we achieve 99.99 percent accuracy in volume measurement.

There seem to be two other posts about the same question. You can learn more at: 
https://support.pix4d.com/hc/en-us/articles/hc/en-us/community/posts/360000675586
https://community.pix4d.com/t/6082

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