RV1 and RV2 look like MOVs to me also.
I'm also curious about other aspects like the actual DC and resistance accuracy.
Also the output voltage and current on the Diode test range and what voltage it measures up to.
Did you see the small guard tracks near the 10A current side? Not really robust, but at least they are there. Also, the LED has it's own container isolating it further. Also, the large plastic dial and carriage help section off the bottom from the top, I think? I also see the bottom has a plastic guard protecting the the bottom of the unit? However, the fuses are small. And on one side they use a glass fuse. I'm not sure what that is except extra protection for the current side? It's an interestingly placed fuse. It has three fuses total.
If so, it's looking pretty decent for 23 bucks. A lot better than their last effort we tore up.
Here are the specs from the Amazon page:
DC Voltage: 400mV, ±(0.5%+5) 4V/40V/400V, ±(0.5%+4) 1000V, ±(1.0%+6)
AC Voltage: 400mV, ±(1.0%+6) 4V/40V/400V/750V, ±(0.8%+10)
DC Current: 400μA/4000μA, ±(1.0%+10) 40mA/400mA, ±(1.2%+8) 10A, ±(1.2%+10)
AC Current: 400μA/4000μA/40mA/400mA, ±(1.5%+10) 10A, ±(2.0%+5)
Resistance: 400Ω, ±(0.8%+5) 4KΩ/40KΩ/400KΩ/4MΩ, ±(0.8%+4) 40MΩ, ±(1.2%+10)
Capacitance: 10nF, ±(5.0%+20) 100nF/1μF/10μF/100μF, ±(3.5%+8) 1mF/10mF/100mF, ±(5.0%+10)
Frequency: 100Hz/1000Hz/10kHz/100kHz/1MHz/30MHz, ±(0.5%+10)