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How can a no-go ring gauge be easily identified?

  1. Color-coded markings

  2. Annular ring on the knurled surface

  3. Shape of the handle

  4. Size of the gauge

The correct answer is: Annular ring on the knurled surface

A no-go ring gauge is identifiable primarily by its design feature, which includes an annular ring on the knurled surface. This distinct physical characteristic serves as an important indicator that the gauge is intended to check the tolerances of a part without allowing it to pass if it reaches the specified limit. The annular ring provides tactile feedback for the user, indicating that the part being measured does not meet the necessary specifications. While some gauges may feature color-coded markings or specific handle shapes, these elements can vary between different gauge manufacturers and may not consistently indicate whether a gauge is a no-go type. Similarly, the size of the gauge does not specifically denote its function as a no-go gauge, since various gauges can come in a range of sizes for different applications. This makes the presence of the annular ring on the knurled surface the most reliable way to identify a no-go ring gauge.