Looks like a pretty simple meter. If you turn it to the off position, does the display blank? (when turning it on, it should show all zeros not matter which function).
If you turn it to the ohms section and touch the leads together, does it go to 1 (or very close)? Change to DC volts and if you touch leads to any battery (black/common to (-) and red to positive (+)), does the display change at all?
I looked at the PDF manual (
http://www.equus.com/Content/Support/Manual/3310.pdf) for this unit and there is a fuse under a panel on the back held with two screws. I doubt it's blown though as the meter probably would not work at all.
Last question, How old is it? You could try replacing the
batteries (two AAA) if it's over a year or so old. I've found that devices that have batteries supplied don't last long at all.