The Vernier Caliper is a precision instrument that can be used to measure internal and external distances extremely accurately. The example shown below is a digital vernier caliper as the distances are read from a LCD display. The most important parts have been labelled.
Earlier versions of this type of measuring instrument had to be read by looking carefully at the imperial or metric scale and there was a need for very good eyesight in order to read the small sliding scale. Manually operated vernier calipers can still be bought and remain popular because they are much cheaper than the digital version. Also, the digital version requires a small battery whereas the manual version does not need any power source.
Digital vernier calipers are easier to use as the measurement is clearly displayed and also, by pressing the inch/mm button the distance can be read as metric or imperial.

The display is turned on with the on/off button. The external jaws should then be brought together until they touch and the zero button should be pressed. The vernier caliper can then be used to measure distances. Always go through this procedure when turning on the display for the first time.

MEASURING EXTERNAL DISTANCES

The material to be measured is placed between the external jaws and they are carefully brought together. The locking screw is tightened so that the jaws do not move apart. The digital display can then be read. The distance can be read by in metric and imperial by pressing the inch/mm button.

QUESTIONS:

1. Explain the procedure for preparing to use the digital vernier caliper.

2. Using a digital vernier caliper, measure four external distances

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