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To use the gauge, screw it into the gauge until the screw stops, and if the pipe end of the screw to be inspected is within the range of the maximum and minimum notches, it is judged that the fit inspection has passed.
[How to use NPT gauge (tapered thread gauge for pipe)]
| Types of screws | Taper internal thread | Taper external thread |
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| A: Position of reference diameter | B: Position of reference diameter | |
| gauge | tapered threaded plug gauge L1 | tapered thread ring gauge L1 |
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| C: Minimum notch D: Acceptance range E: Maximum notch |
F: Minimum notch G: Acceptance range H: Maximum notch |