i have 2 l20s and a xerox of a l20/l30 manual the 1l20 is a bit better then the l20 becaquse it has calibrated dispersion and the person i bought my l20 from about 20 yrs ago replaced it with a 1l20 if "jerky jerk" really cant find a manual maybe i can help him " its becoming that old service manuals and certain hard to come by parts cost more then the equipment is worth" "alot of older service manuals have been thrown away over the years by the companies that originally owned the equipment and the surplus dealers never got them"