Good Good, U Got to cover all the hang HW in Split Second..
If Still dealing with somebody accompanies u(parent etc)
Try tu persuade them to look at the Thing,stuff beside the HW, usually an elctrical stuff,
A tool or what ever, look for the thing that not there or uneasy to find, keep talking to look the thing
(while in the meantime, U have to cover all the HW looking as fast as u can.)
the remaining second when there r about to leave to other department...
use it as extension time to REcheck the HW that U hav aim before...

P/s Dont ever ask them to wait behind U while U Exploring all the HW, That Annoy them