Sensor instrument

A sensor instrument for extracorporeally detecting electrical signals representing electrical activity of cardiac muscle fibers of a subject, comprising:

• a support having two free ends;
• two electrodes;
• said support having two suction elements respectively at said free ends that are operable to extracorporeally affix said free ends of said support to a body surface of a subject, said two suction elements respectively carrying said two electrodes and, when the suction elements are extracorporeally affixed to said body surface, said suction elements causing the respective two electrodes to detect said electrical signals representing said electrical activity of cardiac muscle fibers in said subject;
• each of said two suction elements having a lever actuator adjacent thereto that, when actuated, causes the suction element adjacent thereto to become affixed to the body surface of the subject;
• a manually actuatable button connected to each of said two lever actuators that, when actuated, simultaneously actuates each of said two lever actuators to simultaneously affix each of said two suction elements to the body surface of the subject;
• and
• an electronic module carried by said support and electrically connected to said electrodes, said electronic module being configured to emit a module output signal corresponding to said signals detected by said electrodes.