In IV5.3 "iProperty Collection V1" from http://hjem.get2net.dk/opad/ does just this and works flawlessly (thanks to Patrick de Stobbeleir), it sort of works in IV6 (calculates the scale etc) but at the moment either IV6 is buggy or we are waiting for iProperty Collection V2 as the weights on my machine at least are being calculated as 0.0Kg.
Regards
Matt Hutchinson