When we think about comparative indicators, we usually are referring to dial indicators. However, test indicators also provide comparative measurements. The difference is that while dial indicators sense displacement that is parallel to the axis of the spindle, test indicators are designed to sense and measure displacements that are perpendicular to the shaft of the contact point. Test indicators are referred to by their dial configurations, the most common of which are the front mount, top mount and side mount. There are also two different dial diameters (1.1" and 1.5"). Selection of a test indicator is dependent on how and where it will be used.
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