A system for collecting biosignal data comprising: • a left junction; • aright junction; • a first band extending between the left junction and the right junction; • a second band spanning the left junction and the right junction and offset from the first band; • a second band adjuster configured to adjust a second length of the second band between the left junction and the right junction; • a first electrode fixedly mounted to the first band between the left junction and the right junction; • a first band adjuster configured to adjust a first length of the first band over a range of lengths between the left junction and the right junction; • a first length scale: ∘ depicting a sequence of discrete length values; and ∘ configured to indicate one discrete length value, in the sequence of discrete length values, corresponding to a current length setting of the first band; • a second electrode; • a second electrode adjuster: ∘ arranged on the first band adjacent and laterally offset from the first electrode; ∘ coupling the second electrode to the first band over a second range of electrode positions along the first band; and • a set of electrode position labels indicating discrete lateral positions of the second electrode within the second range of electrode positions: ∘ each electrode position label, in the set of electrode position labels, indicating a target lateral position of the second electrode, within the second range of electrode positions along the first length of the first band, for a particular length value, in the sequence of discrete length values, indicated by the first band scale, ∘ the target lateral position indicated by the electrode position label linked to the particular length value indicated by the first band scale according to an electrode placement standard; and • a third electrode mounted to the second band between the left junction and the right junction. • a left junction; • aright junction; • a first band extending between the left junction and the right junction; • a second band spanning the left junction and the right junction and offset from the first band; • a second band adjuster configured to adjust a second length of the second band between the left junction and the right junction; • a first electrode fixedly mounted to the first band between the left junction and the right junction; • a first band adjuster configured to adjust a first length of the first band over a range of lengths between the left junction and the right junction; • a first length scale: ∘ depicting a sequence of discrete length values; and ∘ configured to indicate one discrete length value, in the sequence of discrete length values, corresponding to a current length setting of the first band; ∘ depicting a sequence of discrete length values; and ∘ configured to indicate one discrete length value, in the sequence of discrete length values, corresponding to a current length setting of the first band; • a second electrode; • a second electrode adjuster: ∘ arranged on the first band adjacent and laterally offset from the first electrode; ∘ coupling the second electrode to the first band over a second range of electrode positions along the first band; and ∘ arranged on the first band adjacent and laterally offset from the first electrode; ∘ coupling the second electrode to the first band over a second range of electrode positions along the first band; and • a set of electrode position labels indicating discrete lateral positions of the second electrode within the second range of electrode positions: ∘ each electrode position label, in the set of electrode position labels, indicating a target lateral position of the second electrode, within the second range of electrode positions along the first length of the first band, for a particular length value, in the sequence of discrete length values, indicated by the first band scale, ∘ the target lateral position indicated by the electrode position label linked to the particular length value indicated by the first band scale according to an electrode placement standard; and ∘ each electrode position label, in the set of electrode position labels, indicating a target lateral position of the second electrode, within the second range of electrode positions along the first length of the first band, for a particular length value, in the sequence of discrete length values, indicated by the first band scale, ∘ the target lateral position indicated by the electrode position label linked to the particular length value indicated by the first band scale according to an electrode placement standard; and • a third electrode mounted to the second band between the left junction and the right junction.