Review on Accurate and Convenient: EASYTOO Universal Magnetic Wheel Alignment Tool for Car/Truck Camber/Castor Strut by Marcus Barlow

A simple spirit level to check side to side alignment. It just magnetically sticks to your rotor and measures camber or caster depending on how it's oriented. I recently adjusted my machine so I knew my exact camber and this tool was off about 0.5 degrees no matter how I attached it. You can tilt the display to fit a known curve, and when you make changes you can see how much it's changed as long as the viewing angle stays the same, and that's probably the best use for such a device. A trick to getting good measurements is to have the rotor at the same height as when the car is on the ground. I like to grab a jack and raise it until it loads the suspension before taking measurements, but if you're just benchmarking it probably doesn't matter, and the tilted display helps make up the difference, given the camber seems much more positive than usual when the suspension is just hanging in the air. I wasn't expecting this gauge to be super accurate, but it at least gives me an idea of approximate camber and caster when changing suspension components. Before dismantling, measure and then compare these values. Camber is the one that changes the most, especially when the stays are removed, but removing the entire lower arm can also change roll. It's always best to do a wheel alignment after some serious suspension work, but if you just want a quick and easy check, this option is fine for what it is.