An intermediary tower-articulated arm device, for attachment to three-point hitch of mounted implements, with ground whells, more specifically, multiple row seed-planters, was developed and tested on draft determination works. A single ring with electrical extensometers connected in full bridge, was used for sense traction compression efforts, anchored by flexible steel cables between the implement bar and the base of the intermediary tower. Designed for works on tie range of 0-6,000N, submitted to static calibration tests, showed high linearity, with R = 0.9997, an excellent zero return and a resolution of around 70N. A seven row seed-planter was then tested in two sites, firm ground, plane and inclined, and plane, prepared for planting. Draft values from the two first conditions were highly consistent with results obtained from simple theoretical calculus. This, allied to it's simplicity of conception, confers to tire device a great deal of reliability. It's use alters the tractor-implement geometry, not being a major problem if there is interest on draft efforts only, for these kind of implements. Results from works in the site prepared for planting, so different from literature citations, say about of convenience of sistematic work for the knowledge of real draft requirements of mounted implements in our conditions.
dynamometry; mounted implemento; draft efforts