[Goldie99]

I'd be inclined to do the same - use it as long as it's legible - once it's gone too far, try the repair. At that point you have nothing to lose.

In the mean time set up the appropriate eBay & Gumtree searches for either a faulty Fluke to salvage a replacement display from, or for the relevant LCD itself, whatever the Fluke (or generic ?) part number is, and just let them run. I've left searches running anything up to a couple of years, but often found the appropriate part I needed, for minimal effort.