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Vernier Caliper Model
written by Fu-Kwun Hwang
edited by Loo Kang Wee and Wolfgang Christian
The Vernier Caliper model shows the principle of operation and the physical parts of a Vernier Caliper.

The Vernier calipers model has
  • an object (Blue) for the internal jaws to measure width of an object with slider to control width of the object and simple drag action to control position of object.
  • an object (Green) for external jaws to measure internal diameter of a cylinder for example with slider to control dimensions of the cylinder.
  • checkbox for answer to show the meaning of reading on the main scale and the vernier scale with zero error calculations if any.
  • drop down menu of the various common vernier scales for sense making and additional testing out by learners their ideas of how vernier works.
  • fine <> control buttons for learners to manipulate the model with single incremental precision
  • slider control for fast changes in the vernier measurement
  • reset button to bring simulaton back to original (default)
The Vernier Caliper model was created using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double click the ejs_ntnu_VernierCaliper.jar file to run the program if Java is installed.

Please note that this resource requires at least version 1.5 of Java (JRE).
1 source code document is available
Subjects Levels Resource Types
General Physics
- Equipment
= Mechanical Equipment
- Measurement/Units
- Lower Undergraduate
- High School
- Middle School
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 5.0/5

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Fu-Kwun Hwang
caliper simulation, measurement
Record Cloner:
Metadata instance created December 12, 2009 by Wolfgang Christian
Record Updated:
June 15, 2020 by Bruce Mason
Last Update
when Cataloged:
September 10, 2009
Other Collections:

AAAS Benchmark Alignments (2008 Version)

11. Common Themes

11B. Models
  • 6-8: 11B/M6. A model can sometimes be used to get ideas about how the thing being modeled actually works, but there is no guarantee that these ideas are correct if they are based on the model alone.

12. Habits of Mind

12B. Computation and Estimation
  • 6-8: 12B/M8. Decide what degree of precision is adequate and round off the result of calculator operations to enough significant figures to reasonably reflect those of the inputs.
12C. Manipulation and Observation
  • 6-8: 12C/M3. Make accurate measurements of length, volume, weight, elapsed time, rates, and temperature by using appropriate devices.
  • 6-8: 12C/M5. Analyze simple mechanical devices and describe what the various parts are for; estimate what the effect of making a change in one part of a device would have on the device as a whole.
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Record Link
AIP Format
F. Hwang, Computer Program VERNIER CALIPER MODEL (2009), WWW Document, (
F. Hwang, Computer Program VERNIER CALIPER MODEL (2009), <>.
APA Format
Hwang, F. (2009). Vernier Caliper Model [Computer software]. Retrieved July 21, 2024, from
Chicago Format
Hwang, Fu-Kwun. "Vernier Caliper Model." (accessed 21 July 2024).
MLA Format
Hwang, Fu-Kwun. Vernier Caliper Model. Computer software. 2009. Java (JRE) 1.5. 21 July 2024 <>.
BibTeX Export Format
@misc{ Author = "Fu-Kwun Hwang", Title = {Vernier Caliper Model}, Month = {September}, Year = {2009} }
Refer Export Format

%A Fu-Kwun Hwang %T Vernier Caliper Model %E Loo Kang Wee %E Wolfgang Christian, (eds) %D September 10, 2009 %U %O application/java

EndNote Export Format

%0 Computer Program %A Hwang, Fu-Kwun %D September 10, 2009 %T Vernier Caliper Model %E Wee, Loo Kang %E Christian, Wolfgang %8 September 10, 2009 %U

Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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Vernier Caliper Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Vernier Caliper Model.

relation by Wolfgang Christian
Covers the Same Topic As

The non Ejs version of the Vernier Caliper Model by Fu-Kwun Hwang that has the input field for student checking their understanding especially useful for learning the importance of precision of measurement.
This is because 19.40 is precise, 19.450 is too precise and 19.4 is not precise enough for the vernier caliper of smallest unit 0.01 mm.

relation by wee lookang

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