A system , comprising: a body having a first end and a second end , the second end spaced from the first end along a length of the body ; a first pair of arms that extend outwardly from the first end of the body , the arms of the first pair of arms spaced laterally apart from one another with respect to a width of the body , each of the arms of the first pair of arms having a respective terminus at a distal end of the arm and each of the arms of the first pair of arms having a respective electrode positioned at least proximate the respective terminus of the arm; a second pair of arms that extend outwardly from the first end of the body , the arms of the second pair of arms spaced laterally apart from one another with respect to a width of the body , each of the arms of the second pair of arms having a respective terminus at a distal end of the arm and each of the arms of the second pair of arms having a respective electrode positioned at least proximate the respective terminus of the arm, wherein the arms of the second pair of arms are pivotable with respect to the arms of the first pair of arms to vary an angle between the electrodes of the arms of the second pair of arms and the electrodes of the arms of the first pair of arms ; at least a first pair of joints , the joints of the first pair of joints respectively pivotally couple respective ones of the arms of the second pair of arms to the body at a first joint location of the body and a second joint location of the body respectively, the first joint location and the second joint location different from one another; and at least one bias mechanism coupled to bias the arms of the second pair of arms toward an un-rotated orientation in which an angle between the arms of the second pair of arms and corresponding ones of the arms of the first pair of arms is a smallest angle achievable therebetween. a body having a first end and a second end , the second end spaced from the first end along a length of the body ; a first pair of arms that extend outwardly from the first end of the body , the arms of the first pair of arms spaced laterally apart from one another with respect to a width of the body , each of the arms of the first pair of arms having a respective terminus at a distal end of the arm and each of the arms of the first pair of arms having a respective electrode positioned at least proximate the respective terminus of the arm; a second pair of arms that extend outwardly from the first end of the body , the arms of the second pair of arms spaced laterally apart from one another with respect to a width of the body , each of the arms of the second pair of arms having a respective terminus at a distal end of the arm and each of the arms of the second pair of arms having a respective electrode positioned at least proximate the respective terminus of the arm, wherein the arms of the second pair of arms are pivotable with respect to the arms of the first pair of arms to vary an angle between the electrodes of the arms of the second pair of arms and the electrodes of the arms of the first pair of arms ; at least a first pair of joints , the joints of the first pair of joints respectively pivotally couple respective ones of the arms of the second pair of arms to the body at a first joint location of the body and a second joint location of the body respectively, the first joint location and the second joint location different from one another; and at least one bias mechanism coupled to bias the arms of the second pair of arms toward an un-rotated orientation in which an angle between the arms of the second pair of arms and corresponding ones of the arms of the first pair of arms is a smallest angle achievable therebetween. <EOS>