PT99430 Starrett Tubes and Plugs complete for 98-6 Level

99430
Starrett Tubes and Plugs Complete for 98 series
Machinists Level 6″

These levels have ground and graduated
main vials. All sizes have a cross test vial
except the 4″ (100mm) model.

The 12″ (300mm) model also has a plumb
vial and the 18″ (450mm) size has a double
plumb vial.

These vials are adjustable to a positive
setting and are housed in a satin finished
brass tube with a friction-fit closing cover to
prevent breakage.

The base of the levels features an involute
groove running the length of the base, which
provides a reliable seat for round work such
as pipes or shafting.

With the cross test vial, it is possible to
simultaneously level in both directions.
This prevents inaccuracies in the main vial
reading caused by canting the level sidewise
on round work.

The 6″ through 18″ (150-450mm) main
level vials have graduations that are
approximately 80-90 seconds or .005″ per
foot (0.42mm per meter). There are five, six,
or seven lines on each side of the bubble,
depending on the base length.