Great to buy now. Please note that in the photos it looks like it will stand alone or can stand alone, but in reality it is not. It would be nice if you could zero the digital meter while it is still level. Another version of this product and I think this one also tells you to zero the digital gauge on a long piece of metal that they don't provide, but it's not entirely clear where to place that metal. behind a tire? Front? On the pages? I know that the meter should be zeroed in the same direction you intend to use it. It's easy to get accurate and repeatable camber measurements. I have never adjusted caster as my car does not. The only thing that confuses you is that you're not on the flattest part of the ground and you're measuring there every time, or at least the part you know is flat. Use your large bubble level from home or the hardware store and find the flattest spot. You may not have skid plates, so measure, adjust, roll the car back and forth to set the suspension, rezero the sensor, then measure again. Do all this on the flattest part of your smoothest floor.