User Manual

Model No. ＧＨＳ-＊＊PRECISION MEASURING TOOLSVERNIER CALIPERS WITH THUMB CLAMP
Thank you for purchasing the VERNIER CALIPERS WITH THUMB CLAMP
This product is a precision measurement tool with a main scale and a vernier scale to indicate the measured value.
●For safe and proper use of this product, please read this instruction manual before use and follow the procedures described. Pleasekeep manual where it is accessible to user for future reference.
●Keep this manual with the instrument if transferred or leased to a third party.
●For inquiries about this product, please contact dealer or Niigata Seiki at the address listed on the following page.

■PART IDENTIFICATION AND FUNCTION⑤Measuring surfaces forinternal measurements④Inside Jaws
③Measuring surfaces forstep measurements

0120

１3２３

4
４

５６

5７８

９6０

7

8

9

10

1112131415ｃｍ

0.05mm⑨Thumb Lock
②Outside Jaws

⑦Depth Bar⑥Main Scale⑩Vernier Slide (Vernier Scale)⑧Measuring surfaces for
depth measurements①Measuring surfaces forexternal measurements①Measuring Surfaces for … Object to be measured is positioned
outside measurements
between these surfaces.
②Outside Jaws ………・ Measures extremal dimensions.
Move Slide to open and close.
③Measuring surfaces for … Measures the height of steps.
step measurements④Inside Jaws …………・ Measures internal dimensions. MoveSlide to open and close.
⑤Measuring surfaces for … Position surfaces inside object to bemeasured.
internal measurements⑥Main Scale …………… Indicates measured value in 1mmgraduations.
⑦Depth Bar …………… Bar for measuring depth. Bar moves
in and out with Vernier Slide.
⑧Measuring surfaces for… Depth is measured between these
two surfaces.
depth measurements⑨Thumb Lock ………… Press to release Vernier Slide fortaking measurement, releasing willautomatically lock Slide in place.
⑩Vernier Slide ………… Scale for measuring with a resolution(Vernier scale)of 0.05mm. Refer to following pagefor instructions on use.

SAFETY PRECAUTIONS Please Observe
Always follow the proper operating procedures in order to prevent
harm to yourself or others, and to prevent damage to property.

Denotes a prohibition-You MUST NOT do

Denotes a requirement-You MUST do

WARNING Indicates risk of personal injury or property damage if not followed.
Read the manual and follow the instructions.
・Use of product other than as described in the manual
may cause accident.
Use only for measuring.
・Use for any purpose other than measuring may
damage or wear the instrument. Improper use may
also cause accident.
Handle with Care.
・Do not drop or subject instrument to excessive shock.
Do not place under heavy objects. Improper handling
may cause damage or poor accuracy.
・Do not scratch instrument, for example by writing IDnumber.

Use in proper environment.
･Please do not use instrument in rain or locations withexcessive humidity. Do not use at extreme high or low
temperatures. Keep out of direct sunlight.
Jaw Tips are sharp - Handle with care.
･Careless handling may cause injury.
Do not move the Vernier slide without pressing
Thumb Lock.
･Excessive force applied to Slide may cause damage oraffect accuracy.
Do not disassemble or modify.
･Do not remove the vernier slide, Please do not attempt
to disassemble or modify as it may cause damage orpoor accuracy.

CALIBRATION●In order to maintain instrument accuracy, it is recommended thataccuracy is confirmed through calibration on a periodic basis.
Wear of measuring surfaces from repeated use may affect accuracy and periodic
accuracy checks should be performed.

We provide calibration services.
Please contact agent in country ofpurchase to make arrangements.

PREPARATION FOR USE
Before using the caliper, follow the steps below:●Do not apply excessive force to Vernier Slide. Pushing against slide, or attempting to move without pressing the Thumb Lock may
cause damage or inaccuracy.
●Wipe off any corrosion, 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 bemeasured and the caliper may cause measurement error. Allow enough time for the temperatures to equilibrate.

●Performing an accuracy check.

①Jaw 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.)②Confirm “0” points on scale (see diagram at right)
With jaws closed as in step ① above, make sure the reading is zero andthe vernier scale graduations align at the “0” and “39” positions as shown.

00③Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading shouldbe “0” as in step ② above, with the vernier graduations aligned at the “0”and “39” positions.

READING THE SCALE

1１２

2
３４

3

５

６

７

4８

９5

０0.05mm

Proper alignment

PREVENTING ERRORSThe 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.

In order to prevent measurement error, please note the following.

Measured value = Main Scale Reading + Vernier Scale Reading＜Flat surfaces＞
When measuring featureswith flat surfaces, make surethe measuring surface of thejaws are parallel to thesurfaces to be measured.

●EXAMPLE１
Main Scale（1㎜）
Vernier Scale（0.05㎜）７

Measured Value: 77.00㎜

８0１９２３10４５６11７８９12０0.05mm

Reading
77＋ 0 .0 077 .0 0

●EXAMPLE２ Measured Value: 77.30㎜
Main Scale（1㎜）
Vernier Scale（0.05㎜）７８0１９２３10４５６11７８９12０0.05mm

Reading
77＋ 0 .3 077 .3 0

●EXAMPLE３ Measured Value: 77.35㎜
Main Scale（1㎜）
Vernier Scale（0.05㎜）７８0

１９２３10４５６11７８９12０0.05mm

Reading
77＋ 0 .3 577 .3 5

AFTER USE CARE, STORAGE NOTES●As required, wipe slide and measuring surfaces 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 to prevent thermal
expansion from creating excessive forces on jaws andaffecting accuracy.
●Store in supplied case when not in use in a cool, dry location.

POSITIONING CALIPER ON OBJECT
Jaw＜Cylindrical surfaces＞
When measuring cylindricalfeatures, make sure thecaliper jaws are perpendicular
to the cylinder axis as shown.

Object being measured

VIEWING THE SCALE
Scale should be read fromdirectly above the calipers.
Due to step in height of vernierscale relative to main scale, if
viewing direction is not directly
above the reading may haveparallax error.

0120１3２３4４５６5７８6９０78910110.05mm

SPECIFICATIONS●Material : Stainless Steel
Model No.

GHS-15

GHS-20Measuring Range

0〜150mm

0〜200mm

Resolution
Accuracy

0.05mm±0.05mm

Niigata seiki Co., Ltd.
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-31-5660 Fax. : +81-256-39-7730

MAIL:intl.sales@niigataseiki.co.jp
URL http://www.niigataseiki.co.jp

I254-K1508