Here's pics of the Holeshot one I use...I've had it for about 10 years now and swear by it. It's considerably less expensive then the Unity and very easy to use...If you can still find it. I know Holeshot still lists them on their web page as a product but it's been years since I've seen one.
Here's the parts that make it up except I forgot to include the RPM camber gauge that comes with it:
Here's how it's used. The axle blocks have 2 holes in it, 1 for 1/8th inch axles and one for the 3/16ths (or is it 5/16ths? I forget) sized axle. You simply insert the axle into the appropriate hole and lock in place with the thumb screw. Then use the riser blocks at the rear of the chassis to level out the chassis. With the axle blocks on you can easily set camber and caster using the RPM gauge. Insert the metal pointers into the axle blocks and set the car on the setup board to set toe.
Because the pointer is fairly long the distance between degree increments is pretty wide making it easy to just adjustments of less then a degree.