I have read of taking an ma reading with a multi meter. Well I have a sperry dm-350a meter. It has a setting that says dcma and the numbers on the dial is 200, 20, 2. Can some one please enlighten me as to what and how to use this feature? And also there is a place on the dial that ia an arrow with a line throught the point. any ideas as to what this is?? Thanks again, snapper