Torque Wrench Calibrator; Torque Screwdriver Testing; Calibration and Inspection The ZNSLA-10 Portable Torque Screwdriver Calibrator is designed for calibrating and testing torque screwdrivers, electric screwdrivers, and pneumatic screwdrivers. It has a measurement range of 1–10 N·m, a resolution of 0.001 N·m, and a measurement accuracy of ±1%. It comes standard with a 1/4" (6.35 mm) connector. It supports switching between multiple torque units and can measure in both forward and reverse directions. The unit features a built-in digital display that provides clear and intuitive readings. The base allows for fixed installation and offers a sturdy structure, making it suitable for factory quality control and on-site calibration in laboratories. It is a precision testing device for calibrating torque tools.