I see you have no clue of what you are talking about. Self test is not there, becasue the unit is not realiable, or that there is or is not lifetime warranty.
Selftest is there to make sure that at the time of the measurement you can be pretty much certain that it is working as expected. And you can enter the measurement documentation that self test passed, that the battery voltage is xxV and that the unit was last calibrated 14 months ago. This is all extremely important for certain use cases at certain industries. And extremely not important to use cases where the people rate test and measurement equipement from Aliexpress on how nice the animation on the startup screen and whine about the price of a Fluke comapred to an Aneng.
I disagree. It is still useless, in a way that it does not replace or enhance any procedures in industries that need this kind of thing.
- Calibration is still needed, and it is clearly stated on Calibration sticker. If Calibration sticker is unreadable return for calibration.
- Probe cable, and 2 voltage ranges are checked on EXTERNAL known voltages before checking live circuits that can pose health hazard. By Fluke's own statement SelfCheck does not replace that and is not to be used instead. They specifically say it is not replacement for calibration or live test.
- Every meter (including Aneng) has battery self check. They have battery low indicator. If battery low indicator in on, meter is not to be used. If battery indicator is showing battery is OK, then all specifications of meter are in specifications. Nobody gives a FF what battery voltage is.
In fact calibration warning is more than useless because it does not keep a record who and when pressed OK on the warning, and battery and all other checks are only adding work to people, because now they have to do paperwork on that crap too. And writing down a battery voltage, instead of just checking Battery OK.
In fact, this sounds exactly like something invented by someone that was never a technician in critical industries but they wanted to add some cool wanky feature to show innovation.
This switch position will never be used by any people in critical industries. In fact, I could see field manuals enhanced by warnings that it should not be used as a replacement for current safety procedures.