Dial test indicator used for 

Explanation:

Dial test indicators:

• Dial test indicators are a fine precision type of instrument used for comparing and determining the variation in the sizes of components.
• These instruments cannot give a direct reading of the sizes like micrometers and vernier calipers.
• A dial test indicator magnifies small variations in sizes by means of a pointer on a graduated dial.
• This direct reading of the deviations gives an accurate picture of the conditions of the parts being tested.
• The principle of a dial test indicator is the magnification of a small movement of the plunger by converting it into the rotary motion of a pointer on a circular scale.
• For converting the linear motion of the plunger into the rotary motion of the pointer, a rack and pinion mechanism is used.

Indicator stands:

• Dial test indicators are used in conjunction with stands for holding them so that the stand itself may be placed on a datum surface or machine tools.

The different types of stands are:

• magnetic stand with universal clamp
• magnetic stand with flexible post
• general purpose holder with cast iron base.