Come on guys/girls. I refer my honourable friend to my previous answer:
From the Boeing FCTM:
‘Retract the landing gear after a positive rate of climb is indicated on the altimeter.’
So if my company wants me to say ‘positive rate’, that’s fine by me. Yes, I do know that I need to look at the big white needle going clockwise or the alt tape numbers scrolling upwards.
If an airline (&/or Airbus) wanted me to look at three things - baro,radio,vsi I’d do that too. (Do Airbus say that?)
As it is my bunch say ‘When a positive rate of climb is seen on the barometric altimeter, call: “Positive Rate”’ which is pretty clear as to which instrument I need to look at to make sure the houses will be getting smaller.
rgds, stay safe