What is the best mechanical pencil lead size (i.e. 0.5, 0.7 etc) and lead type (I.e....

What is the best mechanical pencil lead size (i.e. 0.5, 0.7 etc) and lead type (I.e. Hb etc) for engineering drawing (isometric and orthogonal) ?

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samet mamat answered 2 years ago

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What is the best mechanical pencil lead size (i.e. 0.5, 0.7 etc) and lead type (I.e....

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