Dial test indicator
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| Dial Indicator, Test Indicator, Magnetic Base & Point Set |
A dial test indicator, also known as a lever arm test indicator or finger indicator, has a smaller measuring range than a standard dial indicator and therefore has the ability to measure in smaller increments. A test indicator measures the deflection of the arm, the probe does not retract but swings in an arc around its hinge point. The lever may be interchanged for length or ball diameter, and permits measurements to be taken in narrow grooves and small bores where the body of a probe type may not reach. If a force is perpendicular to the finger, the linear displacement error is acceptably small within the display range of the dial. Some cheaper models of test indicators may come with a pear-shaped contact point in an attempt to compensate for cosine error.
Contact points of higher end test indicators come with a standard carbide sphere at 1, 2, or 3 mm diameter. More usable materials are available for contact points such as ruby, teflon and PVC.
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