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Is there a tool I can download for free to help me measure online blueprints? - online blueprints for swing sets

I do a lot of the estimate for a firm, flat, and some general contractors, we only need to send digital copies of plans on CD or via e-mail. I have programs like Quest costs up to $ 3000.00 and all you have to do is easy to measure from point A to point B. You do not tell me anything no matter how much I have to install, cost, etc. need, because I can not do it myself. All you need is the total area and that's all.