Just so everyone understands:
The Road Force portion of a Road Force balancer is all about uniformity - think *Out of Round* and you will be close. What the machine does is measures the amount of force that the tire and wheel assembly is generating - up and down (called the radial direction) and side to side (called the lateral direction). What it reports is the radial direction - which is the most important value.
There is another direction that the machine doesn't measure, but if that is a problem, you've got way bigger problems than just the tires and wheels.
One of the nice features of the Hunter GSP9700 is that it measures both the assembly and the wheel, and can calculate where the tire needs to be oriented relative to the wheel to get the lowest force.
Please note: The machine is not perfect. It uses a small diameter wheel, while the road surface is flat. That means the machine tends to emphasize short duration *Out of Roundness*, and de-emphasize long duration *Out of Roundness*. That means you can get both false positives (Large values that are rally small values) and false negatives (small values that are really large).
And, as always, the technician operating the machine needs to know what he is doing to get good results.