You did a great job of bringing the fluke back to life, Smashing :-D You can never have enough multimeters. Two meters are handy for monitoring voltages on a amplifier. The cheap yellow 820b types are good for basic monitoring.

I wouldn’t have used the sandpaper on the gold plated contacts myself, but all worked out fine. Great job!

My guess with the 420k resistor… the fluke 87 is a 4000 count meter, so you are out of range for Kilo Ohms… that is why the meter switches to Mega Ohms.

Hi, please can you help me? My meter is not give beep on the check of the diodt.

Small fluke is average multimeter, 87v true rms