This probe design is little more than a 3D printed case, an old power supply toroid ... one half in each side of the clamp. An opamp circuit provides a gain of 100 to boost the hall effect ...

USB1.1 PHY Feature USB 1.1 On-The-Go PHY; UMC 0.11um HS/AE (AL Advanced Enhancement) Logic Process, without internal power clamping circuit View USB1.1 PHY Feature USB 1.1 On-The-Go PHY; UMC 0.11um HS ...