Been told the ones that come with the unit are not as good as they could be
UT61+ is also not as good as a DMM could be.
The posted picture with the fuse already looks much better then I would expect of a DMM in that price class.
Note there are (more expensive) DMM's with CAT IV ratings, but do note that this is
ONLY relevant if you are actually doing CAT IV measurements. And that is before the mains fuses in your house. To reach that, you would have to break some seals in the metering box. And nobody in their right mind would use an UT61+ in those circumstances. For any household measurements your UT61+ is just fine.