Regarding Martin's comment about meters not going back down to 3 decimal places (around 17:50), I believe it has do with the IC being used. I haven't found who makes the main IC, but I suspect it is some Fortune Semiconductor variation.
If you look at the FS9922 datasheet, a 6000 count IC, the auto range up count is 6040 and the auto range down count is 560. So if I'm reading it correctly, the multimeter should display 6.039 before going to 6.04. It will then go back to 3 decimal places at 5.480 (6040 - 560).