Those free meters have gone through several hardware changes over the years to reduce cost. Even if we saw a difference between the two meters I show, I couldn't tell you if it had anything to do with the label or not.
Is 1100V the limit? Seems to me like a 2000 count meter should be able to display 2000V...
Meter1 is the most recent marked 250V on selector. Note how large print in the back "Do not test voltages over 250 volts".
Meter2 is from when I started running these tests marked 1kV on selector.
Meter3 is the oldest revision I have.
Note how the input has changed over the years to reduce cost. As far as your thoughts on 2000 count meters should all handle 2kV. I guess then the UT61E at 20k counts should handle 20kV and the 300k count GMW should handle 300,000 volts?
Maybe you feel all meters should display a minimum of 2kVDC? Again, I'm not shy about running them. Maybe the 121GW, UT91E, the yellow and the latest at 2kV with the meters set to their highest DCV settings.
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There were a few people running a similar test using an insulation tester. Of course, it folds back. If we run it, the power supply will have enough power available to not fold back. Are you going to perform the same test with one of your new meters as well?