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iDad has it on the dot with the marquee tool though. If you look at his image you will see he also set the specific width and height that you wanted from his marquee. 100% pinpoint accuracy.

Having a hard time with it? Zoom right in and drag around your premade selection.

If you're still having a hard time lining it up you can use guides.

To add guides you need to have rulers visible (Ctrl+R or Apple+R) and then drag out from the top and side. For the best accuracy you can zoom in to set your start point guides.

You can also specify where the ruler starts from by clicking and holding the top left corner between the rulers and moving it to the point where you want to start your selection.

Hope this helps!