It also compensates for image ratios which many knob types don't and then you get the wrong results. And, you can always download another one. Once you forget it it becomes much more unlikely that you would forget it again.
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Thanks for all the great input guys! And Bob, thank you for the card. I'm going to try this method out.
I've only been shooting with a 4x5 for about a year and have found that using a measurable scale takes some of the guess work out of the process. There are so many ways to screw up a shot! Keeping things simple and repeatable are key for me.
To ascertain the profundity of field, one needs to first choose what will be considered acceptably sharp.