http://www.ehow.com/video_4420508_do-rough-duct-test.html

I am surprised to see your answer. If you don't know what the 'Ductor Test' is, you should not answer simply by searching internet and find something else that is completely different from what you are answering. I am pretty sure you don't know what is 'Ductor Test' is – otherwise you wouldn't indicate 'Duct Test' as 'Ductor Test'. The 'Ductor Test' is used to determine contact resistance in micro-ohm range for the high current carrying devices such as beaker contacts, bus bar connections etc.