Uni-T UT58E on the 200MΩ scale

[cosmicray]

I'm well aware that this meter is down-market for EEVBlog, but work with me for a moment.

On the 200M Ω scale, with either the jumper clips or the test probe leads shorted together, I see 9.96 MΩ on the display.

The manual says two things, and presumably they are additive ...

Range 200M Ω
Resolution 0.01MΩ
Accuracy ±5% (reading-1000)+10)

At 200MΩ range, the test leads are shorted and the displayed value is 1000 digits. To ensure the accuracy, please subtract this value from display reading.

A '1005' chip resistor (in theory 10MΩ 2512 footprint) reads 19.92MΩ

Is all of that telling me that our ability to come anywhere near 0.0MΩ is non-existent and what you get is what you deserve ? 

[siealex]

Subtract 10 MΩ from anything you see on the display. Such devices use a different method on 200 and 2000 MΩ ranges that always gives a constant shift by 10 or 100 counts. On the other hand, this method allows to measure up to 2 GΩ without using 100 MΩ or 1 GΩ calibrated resistors.

[cosmicray]

Thanks ! I'm still trying to wrap my head around the why. Measuring anything at that high of a resistance (in this situation above 2M Ω) has to be tricky, as the current flows will be very small. I guess the associated question is, why they chose to jump from 2M to 200M, instead of merely doing 20M instead. Are there that many valid use cases for measuring resistance above 20M Ω ?

Otherwise, the DMM seems to be quite accurate on the other scales.