AstroAI Multimeter Tester, TRMS 4000 Counts Volt Meter Auto-Ranging Ohmmeter Digital 1.5v/9v/12v Battery Voltage Tester Measure Voltage Current Resistance Diodes Continuity Capacitance with NCV

Ditch the battery tester. I use this multimeter. https://www.amazon.com/dp/B08DHHJPS1

Do I need a USB multimeter? I was planning to buy a multimeter for my car battery. Something like this: https://a.co/d/0iXvFO71 can I use this?

I use this cheap meter for most things. Just set it to 'V' to check voltage on a Liion battery. From Amazon. Maybe you can get it there ? https://www.amazon.com/dp/B08DHHJPS1