I guess I need a new multimeter.

My Radio-Shack failed the drunken-drop-test, so I replaced it back in '20 with a Southwire multimeter from Lowes.  Recently it has been intermittently failing in the DC mA mode which I need to check bias on my amp.  By intermittently failing, what I mean is that when I select DC mA it does not seem to always go into that mode, as evidenced by no bias reading (when there obviously is current there) and it also shuts the current off to the tubes when attached to the bias plug and inserted into the bias jack on the back of the amp. 

This has happened on two separate occasions now, and I' do not want to risk damage to the amp, so I feel it would be prudent just to buy a new meter.  I don't need a "professional grade" meter, and what I was feeling inclined to doing was to either go to RadioShack's site and order one, or to order one through Amazon, but I was thinking that I would probably get some good suggestions if I asked for advice on the subject here.

TIA.