If I'm going to spin test my broadheads, do I need a broadhead wrench?

No, thats to screw the broadhead in. However, once you spin test, you may heat the head up to twist it, then a broadhead wrence comes in handy so you dont burn your hands.

You should have a broadhead wrench so you can turn the broadhead and not burn/cut your hand/fingers.

But for spin testing them you need THIS

Or cut your fingers, Zac wadzup?