Examples of micrometer readings for measurement practice.

Problem Analysis:

The image shows a series of 12 calipers (or micrometers), each with a scale and a measurement reading. The task is to determine the measurements for each caliper based on the visible markings.

Key Points for Solving:

1. Caliper Basics:
- Calipers typically have two scales: a main scale and a secondary scale (often called the thimble scale).
- The main scale provides the primary measurement, while the thimble scale provides finer increments.
- The measurement is read by combining the values from both scales.

2. Reading the Scales:
- Main Scale: This is usually marked in larger increments (e.g., millimeters or fractions of an inch).
- Thimble Scale: This is marked in smaller increments (e.g., 0.01 mm or 0.001 inches).

3. Combining Readings:
- Add the value from the main scale to the value from the thimble scale to get the total measurement.

Step-by-Step Solution:

#### Caliper 1:
- Main Scale: The main scale reads between 7 and 8.
- Thimble Scale: The thimble scale aligns with the 0.5 mark.
- Total Measurement: \( 7 + 0.5 = 7.5 \) mm.

#### Caliper 2:
- Main Scale: The main scale reads between 0 and 1.
- Thimble Scale: The thimble scale aligns with the 0.0 mark.
- Total Measurement: \( 0 + 0.0 = 0.0 \) mm.

#### Caliper 3:
- Main Scale: The main scale reads between 4 and 5.
- Thimble Scale: The thimble scale aligns with the 0.3 mark.
- Total Measurement: \( 4 + 0.3 = 4.3 \) mm.

#### Caliper 4:
- Main Scale: The main scale reads between 0 and 1.
- Thimble Scale: The thimble scale aligns with the 0.0 mark.
- Total Measurement: \( 0 + 0.0 = 0.0 \) mm.

#### Caliper 5:
- Main Scale: The main scale reads between 7 and 8.
- Thimble Scale: The thimble scale aligns with the 0.6 mark.
- Total Measurement: \( 7 + 0.6 = 7.6 \) mm.

#### Caliper 6:
- Main Scale: The main scale reads between 2 and 3.
- Thimble Scale: The thimble scale aligns with the 0.2 mark.
- Total Measurement: \( 2 + 0.2 = 2.2 \) mm.

#### Caliper 7:
- Main Scale: The main scale reads between 7 and 8.
- Thimble Scale: The thimble scale aligns with the 0.4 mark.
- Total Measurement: \( 7 + 0.4 = 7.4 \) mm.

#### Caliper 8:
- Main Scale: The main scale reads between 0 and 1.
- Thimble Scale: The thimble scale aligns with the 0.0 mark.
- Total Measurement: \( 0 + 0.0 = 0.0 \) mm.

#### Caliper 9:
- Main Scale: The main scale reads between 0 and 1.
- Thimble Scale: The thimble scale aligns with the 0.1 mark.
- Total Measurement: \( 0 + 0.1 = 0.1 \) mm.

#### Caliper 10:
- Main Scale: The main scale reads between 5 and 6.
- Thimble Scale: The thimble scale aligns with the 0.3 mark.
- Total Measurement: \( 5 + 0.3 = 5.3 \) mm.

#### Caliper 11:
- Main Scale: The main scale reads between 8 and 9.
- Thimble Scale: The thimble scale aligns with the 0.7 mark.
- Total Measurement: \( 8 + 0.7 = 8.7 \) mm.

#### Caliper 12:
- Main Scale: The main scale reads between 4 and 5.
- Thimble Scale: The thimble scale aligns with the 0.4 mark.
- Total Measurement: \( 4 + 0.4 = 4.4 \) mm.

Final Answers:

\[
\boxed{
\begin{array}{cccc}
1. & 7.5 & \text{mm} & 4. & 0.0 & \text{mm} & 7. & 7.4 & \text{mm} & 10. & 5.3 & \text{mm} \\
2. & 0.0 & \text{mm} & 5. & 7.6 & \text{mm} & 8. & 0.0 & \text{mm} & 11. & 8.7 & \text{mm} \\
3. & 4.3 & \text{mm} & 6. & 2.2 & \text{mm} & 9. & 0.1 & \text{mm} & 12. & 4.4 & \text{mm} \\
\end{array}
}
\]