Recently ( a couple of weeks ago ) I had cause to take my old vintage 1980 Fluke 8020A DMM out into the field literally to work on a wood chipping machine.
The day was bright and warm, the job lasted about 5 hours and by end of day the LCD display had developed some random black spots.
I was wondering if there were any similar experiences with the display and whether this is going to progress and become detrimental.