This is an extension rod type inside micrometer that offers you the following benefits:

• Interchangeable extensions with cylindrical gage rods are spring-mounted in protective sleeves so you can extend the measuring range.
• Carbide measuring faces.
• Digimatic type, with data output. -It has excellent resistance against water and dust (IP65 protection level) enabling you to use it in machining situations that include splashing coolant fluid.