25mm Conical Test Finger Probe Handle – Precision Safety Testing Tool for IEC & EN Compliance Product Introduction: At He Jin, we understand that every test represents a promise — a promise of safety, quality, and trust. The 25mm Conical Test Finger Probe Handle embodies that commitment. Designed and manufactured by our professional R&D team, it accurately simulates a human finger’s shape and size to test the accessibility of live parts and hazardous mechanical components in