Getting an accurate weight?

We need to accurately weight our robot, and don't own any scales that can do it.

Any suggestions of the best way to go about this?

We have been so far weighing ourselves (on bathroom scales..), and then weighing ourselves holding the robot. It sort of works...

Go to your local post office or buy a set of fishing scales

eg http://www.toolbuddy.co.uk/digital-scal ... -944-p.asp

I'd like to post this robot please.......

Fishing scales, good idea!