The Measuring Head Weight Calibration Device works with the Tensile Strength and Ductility Tester (TSDT) to allow its user to calibrate a weight indicator in less than 15 minutes, all from the back of the truck! No more extensive setup, hooking up sheaves and known weights and taking up large amounts of space for long periods of timeā¦ With this innovative system, simply use a hydraulic hand pump to apply pressure between the line clamps of the TSDT and Weight Cal Device, and adjust your weight indicator to match the value returned by the data logger supplied with your TSDT.