Recommendations for a battery tester? I'm open to other devices that aren't limited to testing batteries

I'm slowly switching to rechargeable ones (Ikea Ladda ones), but we still have lots of other batteries around.

Do you have a favourite device to test them with? Ideally it could test many different types (regular, coin), but I'm ok with just AA/AAA if there is a cheap/reliable option.

When I did a search just now, I saw recommendations both for and against multimeters/voltmeters. Some said it was easier, and others said that it wasn't accurate because of testing under load.

Thanks :)