Hauptner 30/50ml Tension Screw J0031D13 on a Hauptner syringe controls the tension of the syringe's plunger . The plunger, also known as the piston, pushes liquid out of the syringe through the needle .
Hauptner 30/50ml Tension Screw J0031D13 on a Hauptner syringe controls the tension of the syringe's plunger . The plunger, also known as the piston, pushes liquid out of the syringe through the needle .