Yes you can measure real distances after scanning an object, but you have to import the scanned file into a program such as Solidworks or metrology software.
How big is your object and what resolution are you looking to get (high, medium, low)?
Well it has been 3 years and I just ran across this thread. I assume you got things taken care of.
For others, we now have a David (now HP) structured light 3D scanner system that does a great job at a reasonable cost for scanning. It works best on matte finish monochrome parts but can scan color. Shiny areas can be problematic but for that, we apply a spray on powder that washes off or can be wiped off.
3x3 cm to smaller is doable as are much larger things. Nothing special needs to be done on the customer’s end prior to scanning other than delivering the part.