Objective: The measurement of the forceps depth can be inferred by measuring the inactive portion of the forceps or length of shanks (LOSM). This study was designed to evaluate the accuracy and interobserver variability of the LOSM compared with the De Lee station. Material and Methods: Three clinical scenarios with predetermined position, station, and measurement of shanks were created using life-size manikins for the teaching of operative vaginal deliveries (Simulaids, Inc). The fetal heads have palpable—but not visible—landmarks. The forceps were taped to the fetal heads to stabilize them. The abdomen of the manikin was covered. The participants were instructed to evaluate fetal position and station and to measure the shanks from the introitus. Tukey and χ 2 tests were used. A P <0.05 was considered significant. Results: Twenty-three residents and faculty members participated in the study. The average agreement of position was 71.0%. A perfect agreement was seen in 18.8% of station evaluations and 36.2% of the LOSM ( P = 0.02). The table shows the average differences between the clinical measurements and the set situation. Scenario A Scenario B Scenario C Δ Station: (median/range) 0 (−3 to 3) 1 (−2 to 2) −2 (−4 to −1) Δ LOSM: (x ± SD) 0.6 ± 0.6 0.02 ± 0.4 −0.043 ± 0.4 In all scenarios, the average difference of LOSM was lower than the differences in station (A and C: P < 0.001). Conclusion: The LOSM is more accurate and has less variability than the use of the fetal station to determine the station of operative vaginal deliveries.