w/o optical drive and expresscard/34 4-in-1 reader) Tipped library's 'official Thinkpad scale' Pelouze Y50 50lbx2oz at (it is slightly off, only use for comparison between years) USPS Post Office - Pennsylvania Model 7300 It says screen is 230 nits, but tabook says 250 nits. ( see its faster, bigger, heavier W520 sibling review also, some components are common) Tech Spec Lenovo Thinkpad T420s review Lenovo Thinkpad T420s review