No, not quite. It is actually impossible to measure a voltage without any current flow, ever so slight but it is always there. It is perfectly possible to measure temperature and altitude entirely independently of each other.
My grasp on electricity is elementary, but as I understand it: measuring current in a circuit with a scope is always done via a conversion to a voltage, because that is what the scope is designed to measure. So the current is always derived from a measured voltage.
With my silly thermometer example I meant: you can boil water, measure the temperature and derive the atmospheric pressure and altitude. Should have probably worded that clearer.
Edit: and yes I understand what you are saying. Internally the scope measures voltage using the current that’s flowing across something with a very high resistance.
