Is this a cheap Chinese fuse or a current shunt?
As @FakeMoustache says, the part you have indicated with "fuse?" is a current shunt.

To be exact, it is the shunt for the 10A current range of the meter.  R13 (just above the large shunt) would appear to be the shunt for lower currents.

The notches in the 10A shunt are from the "fine tuning."  The shunt is made with a resistance that is a little too low.  Then there is a calibration step where bits are shaved off of the shunt until the current measurement is correct.  High current shunts in more expensive meters don't necessarily look any better.

The other two pads you indicated might be for a fuse that isn't installed in this model.  I searched for images of the 830B, and found similar meters with similar pads that were marked "fuse" - but which also did not have a fuse installed.  I expect there's  jumper or trace on the other side of the board that can be removed or cut when a fuse holder (or just a fuse) is installed.