Smithsonian museums continue to be closed to support the effort to contain the spread of COVID-19. Read a message from our director, and check our website and social media for updates.

Safe-T 43033 Fold-n-Rule

Safe-T 43033 Fold-n-Rule

<< >>
Usage conditions apply
This orange plastic ruler has a 12" scale divided to 1/16" on one edge and a 30 cm scale divided to millimeters on the other edge. The rule is marked: Fold-n-RuleTM by SAFE-TTM. It is also marked: SAFE-T PLASTICTM #43033. The shatter-resistant ruler folds in half to fit in a pocket, purse, or pencil box. It was received in clear plastic packaging with a cardboard label. According to the donor, the ruler was designed for use with an overhead projector. It sold for $1.39 in 2000.
References: Safe-T/Basics by Extra Measures, Inc., about 2000; accession file.
Currently not on view
Object Name
scale rule
date made
Extra Measures, Inc.
Safe-T Products, Inc.
place made
associated place
United States: Illinois, Bensenville
Physical Description
paper (overall material)
plastic (overall material)
overall:.1 cm x 31.4 cm x 3.5 cm; 1/32 in x 12 3/8 in x 1 3/8 in
ID Number
accession number
catalog number
Credit Line
Gift of Extra Measures, Inc.
Rule, Measuring
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Scale Rules
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Note: Comment submission on our collection pages is temporarily unavailable. Please check back soon!

If you have a question or require a personal response, please visit our FAQ or contact page.