INSTRUCTION MANUAL Model No. ＧＨＢ-＊＊PRECISION MEASURING TOOLSVERNIER CALIPERS WITH FINE ADJUSTMENT

Thank you for purchasing the Niigata Seiki Vernier Calipers with Fine Adjustment.
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.
Please keep 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 for inside measurements④Inside Jaws
③Measuring
surfaces for stepmeasurements⑦Fine Adjust Lock

⑥Lock Screw

010

20
030

.１0.２0

.３0

40.４0

.５0

50.６0

.７0

60.８0

.９0

70

80

90

100

110

120

130 ｍｍ０0.02mm⑪Fine Adjust Feed
②Outside Jaws

⑨Depth Bar⑧Main Scale⑩Measuring surfaces fordepth measurements⑫Vernier Slide (Vernier Scale)①Measuring surfaces for outside measurements⑦Fine Adjust Lock

Tighten to use Fine Adjustment.

①Measuring Surfaces foroutside measurements

Position measured object
between these surfaces.

②Outside Jaws

Measures external dimensions.
Move Slide to open and close.

⑧Main Scale

Indicates measured value in 1mm graduations.

③Measuring surfaces forstep measurements

Measures the height of steps.

⑨Depth Bar

Bar for measuring depth. Bar moves in and out
with Vernier Slide.

④Inside Jaws

Measures internal dimensions.
Move Slide to open and close.

⑩Measuring surfaces for
depthmeasurements

Depth is measured between these two surfaces.

⑤Measuring surfaces forinside measurements

Position surfaces inside object
to be measured.

⑪Fine Adjust Feed

Rotate wheel for fine adjustment.

⑥Lock Screw

Locks the Vernier Slide.

⑫Vernier Slide(Vernier Scale)

Scale for measuring with a resolution of 0.02mm.
Refer to following page for usage instructions.

※ For Fine Adjustment, Loosen Lock Screw ⑥,and tighten Fine Adjust Lock ⑦. Rotate Fine Adjust Feed wheel ⑪.

SAFETY PRECAUTIONS
To prevent injury to yourself and others, and to prevent damage toproperty, always follow the procedures marked with the following
symbols.

WARNING

Please Observe
Denotes a prohibition –You MUST NOT do

Denotes a requirement –You MUST do

Indicates risk of personal injury or property damage if not followed.

Read the manual and follow the directions.
・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.
Use only in suitable environment.
・Do not use in locations that are humid, wet, very hot,cold, or in direct sunlight.

CALIBRATION

Handle with care.
・Do not drop or subject instrument to excessive shock. Do
not place under heavy objects. Improper handling maycause damage or poor accuracy.
・Do not scratch instrument, for example by writing ID number.
Jaw tips are sharp̶Handle with care.
・Careless handling may cause injury.
Do not disassemble or modify.
・Do not remove the vernier slide, Please do not attempt todisassemble or modify as it may cause damage or pooraccuracy.

●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 andperiodic 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:●Wipe off rust proofing and dirt 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 thetemperatures 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.)

0②Confirm “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 “49” positions as shown.

010.１0.２0

20.３0.４0

30.５0.６0

50

40.７0.８0.９0

０0.02mm③Depth Confirmation
Position caliper on a flat surface for depth measurement. Reading shouldbe “0” as in step ② above, with the vernier scale graduations aligned at the“0” and “49” positions.

Check alignment

READING THE SCALEPREVENTING ERRORSThe measured value is determined by reading the main scale,and then adding the Vernier Scale reading determined by theposition 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●EXAMPLE 170

Main Scale(1mm)
Vernier Scale(0.02mm)

Measured Value: 77.00mm

80０.１０●EXAMPLE 270

Main Scale(1mm)
Vernier Scale(0.02mm)

.２０

80
０70

.１０

90
.２０.４０.５０110.６０.７０120.８０.９０Reading
77＋ 0 .0 0
7 7 .0 0０.３０

100.４０.５０110.６０.７０120.８０.９００.１０

90.２０.３０100.４０.５０110.６０.７０120.８０.９００＜Flat surfaces＞
Position the caliper
perpendicular to thesurfaces to be measured.

Jaw＜Cylindrical surfaces＞
Position the caliper
perpendicular to the axisof the cylinder.

Measured
Object

VIEWING THE SCALE
Reading
77＋ 0 .3 07 7 .3 0

Measured Value: 77.36mm

80０.３０100

Measured Value: 77.30mm●EXAMPLE 3
Main Scale(1mm)
Vernier Scale(0.02mm)90

POSITIONING CALIPER ON OBJECT

Reading
77＋ 0 .3 6
7 7 .3 6

AFTER USE CARE ・ STORAGE NOTES●Wipe slide, measuring surfaces, and exterior with adry cloth to remove any dirt or oil.
When not in use, apply anti-corrosive treatment or keep inanti-corrosive bag.

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.

SPECIFICATIONS●Material:Stainless Steel (Satin finish)
Model No.

GHB-15

GHB-20

GHB-30Measuring Range

0〜130mm

0〜180mm

0〜280mm

Resolution
Accuracy

0.02mm±0.05mm±0.08mm●When not in use, keep jaws slightly open.

If stored with jaws closed, thermal expansion may create
excessive forces and affect accuracy.

●Store in supplied case in a cool, dry location.

Store away from moisture or direct sunlight, and out of reachof unauthorized personnel.

Niigata seiki Co., Ltd.
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
Tel. : +81-256-31-5670 Fax. : +81-256-39-7730

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

I302-K1606