What is used for measuring certain substances such as pressure?
Pressure is not a substance, its a physical property.
Pressure is force per unit area, it is therefore a physical property, not a substance. However, substances can exert pressure - decreasing the volume of a gas, for example, results in increased pressure.
However, your question is too vague to answer. If you mean "what is used for measuring pressure?" it depends what sort of pressure you're talking about. Gas pressure? Pressure exerted by an object? Pressure exerted by liquids at different depths?
You will need to clarify the question.