These gages are usually hand-held devices used to determine material properties, such as thickness or density, using an americium sealed source.
(These gages; are; T:usually; hand-held devices used to determine material properties, such as thickness or density, using an americium sealed source) (hand-held devices used to determine material properties, such as thickness or density; using; an americium sealed source)
These gages hand-held devices used to determine material properties, such as thickness or density
are using
T:usually hand-held devices used to determine material properties, such as thickness or density, using an americium sealed source
an americium sealed source