Apparently, all the inquisitors wield the same lightsabers with a rotatable double-bladed hilt and two red blades. You can also get the same Inquisitor lightsaber at Zia Sabers.

As Jedi hunters, the spinning lightsabers of inquisitors could serve as a menacing weapon. These lightsabers were built by Imperial engineers with synthetic red Kyber crystals in them.

"There can only be two, a master and an apprentice." Sith lords are always two. The inquisitors are taught in the same way as Sith lords, but they are not counted as Sith lords.

The Grand Inquisitor we see in Clone Wars was the strongest Inquisitor, and he was once a temple guard