Calibrate scene size and position

Hello,
I'm trying to developp an app under unity. I'm using leap motion and occulus rift V2.
I try to interract vith real world object.
I have the same object on my unity 3d scene.

How can I calibrate the scene (size real world / unity) and How can I position the object in the unity scene to have the same position than in the real world.

Thank you

 

Hi,
I am not sure exactly what you are trying to do, but if I am right I may have a way.
I would sujest some sort of board, where your objects will be place at the location they are, eg black dot for bottled, white dot for mug. then you replecate the mesurements in your scene. It would mean setting it up in a spasific way eveytime thought.