Safe-T 43031 4-in-1 Math Ruler

On one side, this 12" rigid white plastic ruler has a scale of inches divided to 1/16" along one edge and a scale of inches divided to 1/10" along the other edge. The ruler is marked: SAFE-T Products™, Inc. It is also marked: 4-in-1 MATH SAFE-T RULER® 43031. It is also marked: SAFE-T PLASTIC®.
The other side has a scale of 30 centimeters along one edge, divided to 1/2 cm, and a scale of 30 centimeters divided to millimeters along the other edge. The interior of this side has tables of metric equivalents for English units of length, area, weights, and capacity (volume). The corners of the ruler are rounded for safety.
Safe-T Products, Inc., of La Grange, Ill., was established in 1992. In 2006 the company became a subsidiary of A. Daigger & Company and its name changed to Classroom Products Warehouse. For company history, see 2000.0160.04. Around 2000, the model number for this object was changed from 43002 to 43031. It sold for 99¢.
References: Safe-T/Basics by Extra Measures, Inc., about 2000; accession file.
Currently not on view
Object Name
scale rule
date made
ca 2000
Extra Measures, Inc.
Safe-T Products, Inc.
Physical Description
plastic (overall material)
overall: .1 cm x 30.6 cm x 2.6 cm; 1/32 in x 12 1/16 in x 1 1/32 in
place made
United States: Illinois
associated place
United States: Illinois, Bensenville
ID Number
accession number
catalog number
Measuring & Mapping
Scale Rules
Science & Mathematics
Rule, Measuring
Metric System
See more items in
Medicine and Science: Mathematics
Scale Rules
Metric System
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Extra Measures, Inc.
Additional Media

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