Fakes are getting better, but they often fail on the details. When you have the mic in hand, check these critical spots: Counterfeit Neumann TLM 103

Instead of just confirming a serial number exists, the tool should provide immediate "birth certificate" data for the user to cross-reference: Manufacturing Date: Display the exact year and month the unit left the factory. Model-Specific Badge Color:

A serial check can also reveal if a microphone has been reported stolen, which is a common issue with used professional gear. 2. Physical "Tell-Tale" Signs

Found on the bottom of the microphone, often on a thin sticker near the base.