Measurement Accuracy Competition

Engineering Context

Quality inspectors must make fast, repeatable measurements and report them with the correct precision.

What You Will Practice

• Select appropriate measuring tools
• Read scales and calipers correctly
• Record units and precision
• Analyze measurement variation

What You Need

• 10-15 mystery objects
• Ruler
• Dial or digital calipers
• Measurement data sheet
• Calculator

Instructions

1. Create a data table with object ID, feature, tool, measurement, and units.
2. Measure each assigned feature once without seeing the reference value.
3. Repeat three selected measurements after a five-minute delay.
4. Calculate the difference between repeated measurements.
5. Compare your results with teacher reference values after all data are submitted.
6. Calculate absolute error for each reference measurement.
7. Identify the tool and feature associated with your largest error.
8. Write a two-step plan for improving measurement reliability.

Engineering Requirements

• Measure at least ten features
• Use the most appropriate available tool
• Record all values with units and realistic precision
• Repeat at least three measurements
• Calculate error or variation correctly

Constraints & Safety

• Do not alter or mark the objects
• Do not share measurements before the class reveal
• Use safe caliper pressure on fragile parts

What You Submit

• Completed measurement table
• Repeated-measurement comparison
• Absolute error calculations
• Accuracy ranking or score
• Improvement plan

Reflection Questions

1. When was a ruler sufficient?
2. When were calipers necessary?
3. Did your repeated measurements agree?
4. What caused your largest error?