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PREPARATION FOR USE
Before using the caliper, follow the steps below:
●
Loosen the lock screw.
Moving the vernier slide with the lock screw tightened may cause excessive force to the slide which will damage the caliper and affect
accuracy.
●
Wipe off any dirt, or oil from measuring surfaces and slide.
Contamination of surfaces may cause measurement error.
●
Allow the caliper and object to be measured time to reach the same temperature.
A temperature difference between the object to be measured and the caliper may cause measurement error. Allow enough time for the
temperatures to equilibrate.
●
Performing an accuracy check.
①
Jaw Alignment
In closed position, make sure the measuring surfaces on the outside jaws
align properly and there is no gap (no light should leak past.)
②
Confirm
“
0
”
points on scale (see diagram at right)
With jaws closed as in step
①
above, make sure the reading is zero and
the vernier scale graduations align at the
“
0
”
and
“
39
”
positions as shown.
③
Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading should
be
“
0
”
as in step
②
above, with the verier graduations aligned at the
“
0
”
and
“
39
”
positions.
READING THE SCALE
The measured value is determined by reading the main scale,
and then adding the Vernier Scale reading as determined by
the position where the vernier and main scale graduations align.
PREVENTING ERRORS
In order to prevent measurement error, please note the following.
AFTER USE CARE, STORAGE NOTES
●
Material : Stainless Steel
GVC-15KDE
150mm
140g
GVC-20KDE
200mm
0.05mm
200g
GVC-30KDE
300mm
380g
±
0.05mm
±
0.08mm
SPECIFICATIONS
●
Wipe slide, measuring surfaces, and exterior with a dry
cloth treated with anti-corrosive oil. When not in use,
apply anti-corrosive treatment or keep in anti-corrosive
bag.
●
When not in use, keep jaws slightly open and lock
screw slightly loose to prevent over tightening due to
thermal expansion which may affect accuracy.
●
Store in supplied case in a cool, dry location. Keep
away from direct sunlight or wet locations and protect
from use by unauthorized personnel.
●
EXAMPLE 1
Measured value = Main Scale R Vernier Scale Reading
7 7
0 . 0 0
＋
7 7 . 0 0
Reading
7 7
0 . 3 0
＋
7 7 . 3 0
Reading
7 7
0 . 3 5
＋
7 7 . 3 5
Reading
Measured Value: 77.00mm
●
EXAMPLE 2
Measured Value: 77.30mm
●
EXAMPLE 3
Measured Value: 77.35mm
POSITIONING CALIPER ON OBJECT
Scale should be read from
directly above the calipers.
Due to step in height of vernier
scale relative to main scale, if
viewing direction is not directly
above the reading may have
parallax error.
＜
Flat surfaces
＞
When measuring features
with flat surfaces, make sure
the measuring surface of the
jaws are parallel to the
surfaces to be measured.
＜
Cylindrical surfaces
＞
When measuring cylindrical
features, make sure the caliper
jaws are perpendicular to the
cylinder axis as shown.
VIEWING THE SCALE
Proper alignment
Workpiece
Jaw
Main Scale
（
1
㎜）
Vernier Scale
（
0.05
㎜）
Main Scale
（
1
㎜）
Vernier Scale
（
0.05
㎜）
Main Scale
（
1
㎜）
Vernier Scale
（
0.05
㎜）
I442-K
2205
Model No.
Measuring Range
Resolution
Maximum
permissible error
Weight
