In engineering, a gauge is used to make measurements. Various types of gauges include:

• Dial test indicator
• Bore gauge
• Feeler gauge
• Fishtail-Center gauge
• Go-NoGo gauge
• Gauge blocks
• Radius gauge
• Thread pitch gauge
• Vernier height gauge
• Pressure gauge
• Temperature gauge
• Level gauge
• Strain gauge

In railroads, the gauges mean,

Rail gauge, the distance between the two rails forming a railroad track.

The nomenclature of gauges are,

• Standard gauge
• Narrow gauge railway
• Broad gauge etc.

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