Lisle46950 Relay Puller Pliers

Is there any advantage to this tool over just swapping in a known good relay? I'm not seeing the value here.

what is the jaw opening at the tip? will it grab small fuses?

Does this work with mitsubishi lancer evo's relays? like the panasonic 8627a030

Can you pull the relay out stick these in the slots and find out if you have 12 volt at the relay Source when you turn the key on with the tester like