Second Life Scale

Just a quicky: In SL, does anyone know how to tweak an avatar to a physical size?  For example, making an avvie six feet tall - it's not obvious from the unitless sliders for each body part in the avatar editor.  Indeed it can't be, because there isn't one for, say, "chest" - the chest parameters (chest, muscularity, fatness, shoulder width) are arbitrary and the chest size is an emergent property of them.

I've seen plenty of gadgets which report back an avatar's height, usually in clothing shops.  They usually startle me with the cartoony hugeness of yer vanilla avatar (apparently it's because the camera is so far away).  I wonder if a thing exists that can do a full stat report?