Super Heavy-Duty Torque Wrench, Click, 1/2" Square Drive, 50 - 250 lbf. FtMagnified view window shows torque value in numbers only Highest quality Japanese spring resists fatigue for long service life Patented dual roller reaction bar system minimizes friction for increased accuracy Hardened steel tube will not deflect under strain and will not be scratched by internal parts, ensuring reduced friction and highest possible accuracy Conversion scale permanently etched into tube for easy conversion to Nm Patented positive lock