A non-motorised injection device for injection of a media into an animal is disclosed. The injection device comprises: - a syringe having a hypodermic needle； - a plunger extending from an end of an elongated push rod into a syringe barrel adapted for receiving said plunger, - a lever connected to the push rod and being configured to actuate the syringe upon being displaced； - a bottle attachment for receiving and retaining a liquid injectable solution containing bottle, wherein the injectable solution is drawn into said syringe barrel from the liquid injectable solution containing bottle, through a connection member extending from the syringe barrel and/or through a bore in the push rod, wherein the injection device comprises a Hall sensor assembly configured to detect the position of the plunger relative to the syringe barrel.
