Measurement type defines the metric system of the data that is entered and which could be used to convert the data entered from one metric system to another.

For example: there is a number type question. As an answer, a doctor from the European part enters the height in cm as a unit of measurement, while doctor from the USA enters the data in feet. In this case, the measurement type will be the same for two designations (height), but the units are different. This will allow you to correlate the data and recalculate them in the future.