I'm jealous, yours has a diode tester but wait, it's the lowest resistance setting on my stable of DMM's. I often have to check fuses in circuit because pulling a fuse could cause a disruption if it's the wrong one or a bolt in fuse. First I check for voltage on either end of a fuse to ground then across the fuse, a good fuse should measure zero volts across it but since I'm not a trusting sort when I'm 'round 'lectrizity, I may check for current flow by touching the leads across the fuse, sometimes with a suitable resistor in series. Only then, set the meter to the ohms scale and start checking. My methodology works for large and bolt in fuses or small fuses that are hard to remove and access. A very useful and interesting item for control circuitry is a small circuit breaker with leads to put across a fuse that's blown to prevent the release of the magic smoke contained in all electrical and electronic gear when one checks for a short circuit. I don't always have room in my pocket for a Variac with a large volt/amp meter. ^_^
TDD