As stated above, beam type are generally not viewed as calibrated precisely but they have the advantage of keeping the original calibration longer than the dial in type.
The dial in, click type, is a great deal easier to use and I find a 1/2" drive very useful for tightening lug nuts to specifications on a regular basis. Just remember to 'back off' the tension after each use. This is very important.
The beam type is difficult to read in some tight places where the scale is not in position to be read. But, as stated previously, it retains near correct readings for a longer period of time. I bought my last one at Sears (lifetime guarantee).
You can join the craftsman tool club from sears and save 10% on purchases (800-682-8691).