The accuracy of micrometers, calipers, dial indicators can be checked by a

Explanation: ​

Slip gauges:

• Slip gauges are very precisely manufactured for measuring, setting up of sizes and also to calibrate precision measuring instruments or inspection gauges.
• They can be used to measure tolerances in the range of 0.001 to 0.0005 mm very accurately. With the slip gauges, we can measure a finer tolerance limit.
• Therefore, slip gauges are used for checking the accuracy of the limit gauge.

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Feeler gauges:

• A feeler gauge is a tool used to measure gap widths.
• Feeler gauges are mostly used in engineering to measure the clearance between two parts like spark plug gaps, bearing clearance, the gap between the mating parts, etc.  
• They consist of a number of small lengths of steel of different thicknesses with measurements marked on each piece.

Ring gauges:

• Ring Gages also referred to as Plain Cylindrical Ring Gauges.
• They are used to check the outside diameter limit on manufactured parts.
• When they are used to check a part directly, the cylindrical ring gages are referred to as GO and NOGO.
• The GO ring gauge checks the upper limit of the part tolerance while the NOGO ring gauge checks the lower limit.

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​Plug gauge:

• A plug gauge is a cylindrical type of gauge, used to check the accuracy of holes.
• They are used to check the inside diameter limit on manufactured parts.
• The GO plug gauge checks the lower limit of the part tolerance while the NOGO plug gauge checks the upper limit.

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