what is this setting on a dmm?

[talon2nr7588 10+ year member]

there is a battery setting that says 1.5 volts and 9 volts. there are both fror the same setting but i don't know what it is for. i'll try to get pics or a link

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[pensacol 10+ year member]

t's for testing batteries. If you select 1.5 and put it on say a AA battery most will show the voltage. It pretty much useless because you can just select 20v DC or whatever you have on there and it will do the same thing.