Device for measuring a change in length

Device (10, 10′) for measuring a change in length (ΔL) with a first fastening element (11, 11′), a second fastening element (12, 12′) and at least one length element (15) arranged between the two fastening elements (11, 11′, 12, 12′) with a first end (15a), a second end (15b) and a length (L) along a longitudinal direction (R), wherein a force (F) acting parallel to the longitudinal direction (R) is configured to lead to a change in length (ΔL) of the length element (15),

• characterized in that, transversely to the longitudinal direction (R), a lever element (20) with a first end (20a), a second end (20b) and a fulcrum (D) is arranged, wherein the lever element (20) comprises a first lever arm (21) with a first length (a) between the fulcrum (D) and a first lever arm end (21a) and a second lever arm (22) with a second length (b) between the fulcrum (D) and a second lever arm end (22b), wherein the second length (b) is larger than the first length (a), wherein the length element (15) with its first end (15a) is pivotably arranged at the first lever arm end (21a) of the first lever arm (21) and wherein the second lever arm end (22b) of the second lever arm (22) is connected to a material measure (30), the movement of which material measure (30) is detectable by a scanning element (40).