Provided herein is an electrode device comprising an interface comprising at least one magnetic contact. In some embodiments, the blood coagulation testing system can operate as an automated thromboelastometry system that is particularly useful, for example, at a point-of-care site. The load current generating section generates a load current based on the load current setting signal to drive the load. The target is displayed on a display along with the monitoring area layout information. A conditioned part inventory is determined based on a loaner part inventory analysis of the segmented inventory.