Reading off graphs

[golden]

With absorbance graphs, if it gives a 2 significant figure scale, are you allowed to estimate to 3 significant figures reading off the graph? With your estimation are you then allowed to use it in your calculations such that if the rest of the information provided is to 3 significant figures you use 3 significant figures in your answer?

[Mao]

With absorbance graphs, if it gives a 2 significant figure scale, are you allowed to estimate to 3 significant figures reading off the graph? With your estimation are you then allowed to use it in your calculations such that if the rest of the information provided is to 3 significant figures you use 3 significant figures in your answer?

When a scale is given, the uncertainty is always half of the scale. So if it gives the result to one decimal place (e.g 1.1), the most accurate reading off the graph would be +/- 0.05.