There is a method of comparing the height of two different characters, for example M4 and V4 and find out the height of each one ?

To change the height of a character which method you recommend ? (for ex from 1.80m to 1.70 m)

thanks

Poser Pro 2014 SR 1 on Windows 7 64 bit
I use IDL, Gamma Correction and EZSkin for all final renders.