Pry the case apart at the bottom to make it easy to work with.

A Flathead 3/32 Screwdriver may help with this.

Avoid using excessive force when lifting the backplate, this could damage the two top retention tabs.

Slide the backplate towards the bottom of the meter, freeing the backplate from the two top retention tabs.

You only need to slide the case apart a little bit to free the backplate from the two top retention tabs.

Remove the backplate and store it in a safe place out of the way.