Setting up HSD coilovers


I have replaced my mk1 with a mk2.5 . It has HSD monopro coilovers. The ride height is set too low (300mm all round from wheen centre to arch) so I am going to change it to 310mm at the front and 320mm at the rear measuing hub to bottom of the arch.

is there a way to check if the damper has extended by the 10 or 20 mm required without dropping and raising the car again ?