Measuring ride height

Lacking the tool,
you can remove one front wheel and but a block under the rotor or spindle with the suspension relaxed and the car leveled from side to side. But it is as good as impossible to relax the suspension using this method, as the side with the tire still on may need to be stretched towards the outboard. But you can get a close approximation if you drop the tire pressure to about 10 psi, and re-level the car. The low pressure will allow the sidewall to deflect under the pain of the tire being too far towards the inside. .
Alternatively you can use a wheeled floor jack under the rotor, and jounce the car a time or two, allowing the jack to be the relaxer, as it rolls from outboard to inboard. With the wheel gone, it is also easier to do the measuring.
Just don't let the car roll off the jack with you under it!