User Manual Model No. GDCT -＊＊＊PRECISION MEASURING TOOLSDIGITAL CALIPERS with TOLERANCE SETTING
Thank you for purchasing Niigata Seiki Digital Calipers.
This is a precision measuring tool for making Inside, Outside, Step Height, and Depth measurements.

●For safe and proper use, 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 FUNCTION ⑨Lock Screw⑤ Measuring surfaces forinside measurements⑩LCD Display⑮ [TOL] Button⑯Output Connector④ Inside Jaws

⑧Scale⑥Depth Bar③Measuring surfaces forstep measurements② Outside Jaws
① Measuring surfaces foroutside measurements⑪ Thumb Wheel⑫Battery Cover⑬ [ZERO/INC] Button⑭ [ON/OFF/P] Button⑦Measuring surfaces
for depth measurements①Measuring Surfaces for outside measurements … Object to be measured is positioned between these surfaces.
②Outside Jaws ……………………………………… For measuring outside dimensions.
③Measuring surfaces for step measurements …… Measures height of steps.
④Inside Jaws………………………………………… For measuring inside dimensions.
⑤Measuring surfaces for inside measurements …… Position surfaces inside object to be measured.
⑥Depth Bar ………………………………………… For measuring depth.
⑦Measuring surfaces for depth measurements …… Depth is measured between these two surfaces.
⑧Scale ……………………………………………… Supports LCD Display Unit.
⑨Lock Screw ……………………………………… Tighten to Prevent the Display Slide from moving.
⑩LCD Display ……………………………………… Displays digital measurement.
⑪Thumb Wheel …………………………………… For adjusting position of Display Slide.
⑫Battery Cover …………………………………… Cover for CR2032 Lithium battery.
⑬[ZERO/INC] Button ……………………………… When pressed, Display will read "0.00".
⑭[ON/OFF/P] Button ……………………………… Power ON/OFF, and setting preset values.
⑮[TOL] Button ……………………………………… Setting tolerance values.
⑯Output Connector ………………………………… Measurement value can be outputted to the PC by connecting BluetoothBOX of the option.

SAFETY PRECAUTIONS
To prevent harm to yourself or others, and to prevent damage toproperty, always follow the procedures marked by 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 this 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 ID
number.
Avoid using in high electric fields, such as nearfluorescent lights or switching power supplies.
・Incorrect value may be displayed on LCD.

Use and store only in environment meeting thefollowing conditions:●Dry location protected from rain, water, and oils.
●Location that is not excessively hot.
●Location protected from use by children andunauthorized people.
・Use in places contrary to the above may cause
damage to the product resulting in accident or injury.
Jaw Tips Are Sharp̶Handle With Care.
・Careless handling may cause injury.
Do not disassemble or modify.
・Disassembly may damage product or cause accident.
For repair, please contact distributor or place ofpurchase.
Do not write on instrument with electric engraver.
・Do not engrave instrument body or jaw, such as an ID
number with engraver or electric pen.

PREPARATION FOR USE
Before using the calipers, please follow the steps below:●Wipe off rust proofing and dirt from measuring surfaces and slide.
Contamination of surfaces may cause measurement error.
●Allow the calipers 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.

INSERTING・REPLACING BATTERY■Power ON/OFF①To turn on, press the [ON/OFF/P] Button.
②To turn off, press and hold the [ON/OFF/P] Button for 2 seconds.

BatterySlide In

Terminals

Terminals

Battery

TROUBLESHOOTING
Q. Nothing is displayed on LCD.
A. The battery may be running low, please replace battery
with a new one.
Q. With power on, the number on the LCD does not change
as Display Unit is moved.
A. Please reset by removing battery for about 30sec., andthen replacing.
Q. Nothing happens when buttons are pressed.
A. Make sure battery is properly inserted.
Q. The correct value is not displayed.
A. High humidity may cause dampness. Please dry off theinstrument and use only in dry location.

AFTER USE CARE・STORAGE

Accuracy※±0.03mm±0.04mm

Weight155g
175g
200g
260g

※Not including quantization error (±1 count)●Resolution : 0.01mm●Display: 6 Digit LCD●Auto Off: approx. 20 min.
●Maximum response speed : Slide to Right .....1.5 m/s
Slide to Left ....... 0.75 m/s※Left/Right as shown in diagram at top of manual.

●Operating Temperature Range :0°
C~ 40°C●Storage Temperature Range : −10°
C~ 60°C●Power: (1x) CR2032 Lithium Battery●Battery Life : approx. 2.5 years in normal use●Accessory : CR2032 Lithium Battery (for test)■Preset Function

Measurement displayed will be offset by a preset value enteredinto the Gauge.
①Loosen the lock screw, and turn on power.
②Press and release the [ON/OFF/P] Button, and “P” icon will
begin to flash on the Display.
③With the “P” icon displayed, press and hold the [ON/OFF/P]
Button to change the position of the blinking character.
④When the desired character is blinking, a short press of the[ON/OFF/P] Button changes the number at that position.
⑤Repeat steps ③, ④ until the desired value is entered on theDisplay.
⑥Move the blinking position back to the “P” icon and press the[ON/OFF/P] Button again briefly. The entered value is now
preset into the Caliper.

■Tolerance Function

Tolerance Mode can be used to verify that a measured value is
within a specified tolerance range.
①When the [TOL] Button is pressed, “ “ will begin to blink on
the LCD and the maximum tolerance value can be entered.
②Press and hold the [TOL] Button to change the position of theblinking character.
③When the desired character is blinking, a short press of the[TOL] Button changes the number at that position.
④Repeat steps ②,③ to enter the desired value, move the active
position to the “ “ icon and press the [TOL] Button.
⑤With the “ “ icon displayed, repeat steps ②,③ to enter theminimum value.
⑥Move the active position to the “ “ icon and press the [TOL] Button.
The tolerance range is now set.
⑦Gauge is ready for measurements when the “TOL” icon is shownon the display.
●If the measurement is within the tolerance range, “GO” is displayedon the LCD.
●If the measurement is above the tolerance range, “ “ is displayedon the LCD.
●If the measurement is below the tolerance range, “ “ is displayedon the LCD.
⑧Press the [TOL] Button to cancel Tolerance Mode.

▲

Measuring Range
0 -100mm
0 -150mm
0 -200mm
0 -300mm①Loosen the lock screw, and turn on power.
②With jaws open to desired reference position (any point is OK,)
press [ZERO/INC] Button.
③When “INC” and “0.00mm” are displayed on LCD, Calipers isready to start measurement.
④To enter Preset Mode, press and hold the [ZERO/INC] Button
until the “INC” icon on the LCD Display is turned off.

▲

PRODUCT SPECIFICATIONS■Comparisons Measure Mode▲

●After use, wipe off any dirt or oil from measuring surfaces,sliding surfaces, and exterior using a dry cloth and perform
rust prevention treatment.
For rust prevention, lightly apply anti-rust oil, or place in rustpreventive bag.
●Store with Jaws slightly open.
If Jaws are closed, expansion due to temperature changes may
cause excessive force which will cause inaccuracy.
●Store in a cool, dry, and dark location in the provided case.
Keep out of direct sunlight and moisture, and please keep
secure from unauthorized personnel.
●Remove battery if Caliper will not be used for a long periodof time.

①Loosen the lock screw, and turn on power.
②With jaws closed, press the [ZERO/INC] Button.
③When “INC” and “0.00mm” are displayed on LCD, Caliper isready to start measurement.
④To enter Preset Mode, press and hold the [ZERO/INC] Button
until the “INC” icon on the LCD Display is turned off.

▲

Pressed DownHook■Absolute Measurement Mode▲

Use only CR2032 typebattery.
●Use care to avoid damaging
Battery
terminals when inserting battery.
Cover●Terminals may be broken if battery ispressed straight down.
●Insert battery at angle, underneath the small hook, as shown.
Notice▲vemoRe① Slide cover in direction of arrow.
② Insert battery with (+) side outward.
③ Replace battery cover.

Model No.
GDCT-100
GDCT-150
GDCT-200
GDCT-300

HOW TO USE

NoticeIf Jaws are opened beyond maximum position,
Thumb Wheel may come loose. Please use care.

SERVICE●If Instrument is not working properly, or if you have anyquestions, please contact distributor or place of purchase.
●Please note, manufacturer is unable to respond to inquires orprovide service directly.
Niigata seiki Co., Ltd.
Please contact distributor
6-15-22, Tsukanome, Sanjo, Niigata, Japan, 955-0055
or place of purchase.
Tel. : +81-256-31-5670 Fax. : +81-256-39-7730

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

I354-K 1803