If you need a new voltmeter with a load. The one on the right is what you want. It's an excellent unit, but does require some knowledge on the part of the user. It displays the voltage digitally, and it works with all chemistry batteries and a wide range of cell counts. You must actually know what voltage you're looking for. There is no go/no go indication.
The unit on the left is not a voltage meter, but is a servo current meter, handy little device too