Here is a voltage divider with a voltmeter attached to measure the output voltage. We have assumed that no current is drawn from the output terminals. In actuality,we would have to have something connected to the output terminals if we are going to be able to tell what the voltage is. That "something" could be a voltmeter or an oscilloscope that measures the output voltage - leaving the user to calculate what the temperature actually is. That something could also be a circuit that will process the voltage in a way that leads to a temperature indication. A voltmeter is shown attached below.
If you attach a voltmeter, then the voltmeter may well draw some current. If that happens, then our analysis is no longer valid. If you can represent the voltmeter's effect by replacing it with a resistor, Rmeter, then you should be able to determine how the output voltage is affected. Do that and write up your analysis explaining as you go along. Your answer will be an analytical expression for the output voltage that includes the resistances in the voltage divider as well as the resistance of the meter.