dealsdigital battery tester, no power supply needed…

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I'm always tempted to order one of these, then I remember I already have a few multi-meters. For $5 (or less) you can get a tester that can do 100+ other tasks.

I never really feel the need to test batteries:
- If my Xbox controller keeps shutting off, I replace the batteries.
- If my smoke detectors beep, I replace their batteries.
- If the "low battery" light is on on device x, etc...

These Meritline testers are good for those non-technical folks in our lives though.