A syringe plunger for insertion within a barrel of a syringe for expelling the contents of the barrel from an open end thereof and a pressure indicator for fitting to a syringe plunger. The syringe plunger and pressure indicator comprising: a first portion； a second portion moveable with respect to the first portion if a relative force between the first portion and the second portion exceeds a threshold； and an indicator, wherein translation of movement of the first portion relative to the second portion causes mechanical movement of the indicator.
