If I know that a balance gives an uncertainty of +- 0.005g, how many significant figures would I need to report on a reading when the counterweights lie exactly on the 8g mark?
Some websites say to have the reading match the uncertainty's decimal places, so it would be 8.000g +- 0.005g. But other websites say to match the uncertainty's number of sig figs, so it would be 8 +- 0.005g. Which should it be?