Made in U.S.A., these rigid rules include a certificate
of calibration traceable to NIST (National Institute of Standards and Technology).
All have a nonglare satin chrome finish for rust and wear resistance. They also
have black etched graduations and are quick-reading with numbered subdivisions for
easy measuring. Meet Fed. Spec. GGG-R-791H for accuracy.
The pro-value rules are hardened, tempered carbon
steel.