Popular cheap one on amazon→ http://amzn.to/2dOJkah The multimeter I use→ http://amzn.to/2dz9iQK This is the type of multimeter that you find at Harbor Freight, Walmart, or Target. It's fine for batteries but not much more. I included some links so you can check out the prices and see a bit more about them. I would recommend spending at least $50 if you think you will be using it often and doing more than test batteries. The better meters are safer and have resistance when testing batteries (more accurate) also they will be auto-ranging. That means you do not need to turn the dial all the time. The one I'm using in the video is a Cen-Tech, P35761 The black one you saw is a ESun DT830 battery testing,voltmeter,multimeter,Battery,9 volt,9v,aa,aaa,1.5v,How-to,Voltage Pro,Test Rite,DT830,