I lost touch if joeqsmith is ranking at different (increasing) levels or just hits them at their fake ratings, overvoltage Cat. xxx test voltages.
It looks like the same crappy PCB layout, kindergarden-grade, as all the low cost chinese DMM's have- bad spacings and traces smoke and burn when overvoltages come in.
If it isn't arcing to the battery holder, it's arcing on the mile long run up to the PTC, or at the fuse holder clips, or the rotary switch etc.
The clamp diodes look better, it's a single TVS on the ANENG 8008/8009 but here it's a 5-diode bridge.
I also don't see the discrete ICL8069 Vref IC, so the on-chip one is used and I wonder how it performs.