            "Here we are!" Ollivander called out, pushing back into the room. He held a dark blue wand box, then slid it over the counter towards Sirius. "This here is a Magometer," he explained as Sirius lifted the lid. Inside, nestled in the tissue paper, sat a rod of clear glass in the shape of a wand. "It measures the potency of a wizard’s magic. Now, usually, the Magometer only picks up a pre-pubescent child’s potency—hormones, just disastrous—but seeing as Mr. Black has only recently come back into his magic, I thought you might give it a whirl." At Sirius’s hesitation, Ollivander picked up the Magometer and held it out. "Don’t worry, it doesn’t actually draw on or perform magic to alert a trace; it only displays the level, if you will. Now that whirl, Mr. Black."