f1004fun, i was using a fluke multimeter. i know what you e refering to but it has always updated fast enough to see primary o2 switching, so it should be ok on the slower switchin cat monitors.
that bein said, i believe you r right about that test. mil eliminators will keep the ses light off for a while though and if you time it right you can pass an echeck.
whats the cost on one of those lc1s?