Value display is not stable

[hongthiet1994]

I have a DMM 12gw eevBlog
I do not know my DMM was error or normal

May be show your DMM ?

Thank you so much
https://youtu.be/E6-Pspjto0g

[BravoV]

Its normal, as the input is very sensitive when opened.

Try short both probes.

[Psi]

Yep, its picking up RF/EMF noise in the air.
Totally normal.
Should go to solid zero when you short the probes together.

Some meters have added hackery/code to try and show 0.0000 if it looks like very small noise, but this is bad because if you actually have a very low signal your meter may lie to you and says its zero.

[Brumby]

This is absolutely normal, especially for low range readings and floating probes.