When you set-up your race car using traditional methods, such as wheel scales, load struts or spring loads, you're using reference measurements. They're called reference measurements because they give you a repeatable reference to go back to or adjust from.

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When you set-up your race car using a Dynamic Scaling System, you're not only measuring the input, you're generating data from your chassis & suspension, showing you the results of your adjustments.

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It's kind of like adjusting timing on your motor. You can use a timing light to know your setting, but it takes an engine dyno to tell you if it's going to make more horsepower.