Yes, on a beam torque wrench, as long as the pointer starts at zero, it will give an accurate reading.
Yes, I've still got the Craftsman torque wrench a girlfriend gave me for a birthday present almost fifty years ago. Still looks and works perfectly.
Yes, buy every one you find for $2 at yard sales, add an extension, appropriate socket and keep one in every vehicle with the spare tire. The little toy lug wrench the OEMs put in with the jack usually won't break loose the lug nuts. It certainly won't tighten them to the specified torque. Best investment you can make.
jack vines