Answer :
Final answer:
The last measurement value that an inspector records when reading a dial caliper is the graduation on the dial closest to the needle. This reading ensures accuracy and precision of the measurement taken. It is essential to consider both the main scale and the dial to obtain the final measurement value.
Explanation:
Reading a Dial Caliper
When using a dial caliper, the final value that an inspector records is crucial for accurate measurements. Typically, the inspector follows a specific sequence of readings. To ensure precision, the last measurement recorded is the graduation on the dial closest to the needle, which provides the most accurate position of the measured object.
Here’s a breakdown of the reading process:
- Identify the main scale graduation: This is the value closest to the zero mark of the dial, aiding in understanding the primary measurement.
- Check the dial graduation: The inspector checks the value on the dial itself, as this indicates the fractional part of the measurement.
- Calculate the final reading: The combination of the main scale reading and the dial graduation gives the complete measurement.
For example, if the main scale reads 5.3 cm and the dial shows a reading that aligns closely with one of its graduations, say 0.07 cm, the complete reading will be 5.37 cm.
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