INSTRUCTION MANUALELECTRONIC DIGITAL THREE-POINT
INTERNAL MICROMETERS

Part Number : MCD3385-**HT<combined>

Thank you for purchasing the Digital 3-Point Micrometer.
Please read this manual thoroughly before use for proper operation.

FEATURES● Easy to read digital display.
● High accuracy 3-point ID measurements.
● Includes extension rod (Deep Hole Extension Rod) for measurements in deep measurements.
● Ring Gauge standard included for origin setting.
● With constant pressure ratchet mechanism.

PART IDENTIFICATIONSPECIFICATIONS● Resolution：0.001mm● Body Material：High Carbon Chromium Bearing Steel

Ratchet Thimble(constant pressure mechanism)
LCD Display

Gauge Tips

● Power：SR44（Silver Oxide Battery）※1x included for testing

Model No.

Measuring Range Maximum Error
(mm)
(µm)

MCD3385-0608HT
MCD3385-0810HT
MCD3385-1012HT
MCD3385-1216HT
MCD3385-1620HT
MCD3385-2025HT
MCD3385-2530HT
MCD3385-3040HT
MCD3385-4050HT
MCD3385-5063HT
MCD3385-6275HT
MCD3385-7588HT
MCD3385-87100HT6－ 8
8 － 10
10 － 1212 － 16
16 － 20
20 － 25
25 － 30
30 － 40
40 － 50
50 － 63
62 － 75
75 － 8887 －100…SETGauge HeadRod[…SET] Button[ABS/INC…UNIT] Button

4

Battery Cover 【BACK】

Deep Hole Extension Rod

Dedicated Spanner (2x)5SR44SR44 (Silver Oxide Battery)
Battery Cover ToolDimensions (mm)※Battery provided for testing.
Please replace with fresh

Ring Gauge Standard[ Body : MCD3385-0608HT～MCD3385-4050HT ]BLess than 285

CDＣA

Ａ

100

Ｂ

100105Less than 1110

[ Body : MCD3385-5063HT～MCD3385-87100HT ]43150

ＣModel No.
MCD3385-0608HT
MCD3385-0810HT
MCD3385-1012HT
MCD3385-1216HT
MCD3385-1620HT
MCD3385-2025HT
MCD3385-2530HT
MCD3385-3040HT
MCD3385-4050HT
MCD3385-5063HT
MCD3385-6275HT
MCD3385-7588HT
MCD3385-87100HT

ABS/INC…UNITＡ
Ｂ

127[ Deep Hole Extension Rod ]Ｄ

INSERTING THE BATTERY
Open

Battery Cover

1. Using the battery cover tool, open the battery cover by rotating in the directionof the arrow.
2. Insert battery with “＋” side outward.
3. Replace battery cover.

PLEASE NOTE
Use only SR44 type battery.

Reverse Side -- How to Use →SETTING THE ORIGIN
Set the origin to be used for measurement.
The origin is stored even when power is off, so it does not have to be reset every time
power is turned on. When the battery is replaced, the origin will have to be reset.

“Click, Click”

1. Prepare instrument and ring gauge by cleaning measurement head and ring gauge
inner diameter with appropriate cleaner.
2. Press the [ …SET ] button to turn on power.
3. Press and hold the [ …SET ] button for more than thee seconds, “Set” will display
on LCD and will start blinking when you release the button.
Confirm that the displayed value matches the dimensions of the ring gauge standard.
If they do not match, use the following procedure to modify.

2 Turn…SET

ABS/INC…UNIT

Ratchet Thimble…SET

With “Set” flashing on LCD, a long press on the [ …SET ] button will move theblinking to the readout digits in sequence. A short press on the [ …SET ] button willchange the value at the cursor. Repeat until correct value has been entered and “Set”
blinks.

ABS/INC…UNIT

3 Press
Confirm displayedvalue matches
ring gauge dimensions.

1Insert

4. Insert the measurement head into the ring gauge and turn the thimble until themeasuring surfaces make contact with the inside of the ring gauge. Continue turning
until ratchet stop “clicks” 1~3 times. See Figure 1
5. Press the [ …SET ] button. The flashing “Set” will disappear. The displayed value
should match the dimension of the ring gauge standard, and origin setting iscomplete.

Figure 1

DEEP HOLE EXTENSION ROD
Use the following procedure and the special spanners provided to attach the deep holeextension rod.
1. Place the accessory spanners into the notches above and below the split in the rod
and turn to separate the rod into two parts, the “gauge head” and “display unit.”
See Figure 2

Figure 2

RodNotch

2. Attach the extension rod to the measurement head and then attach to the display
unit. Tighten with accessory spanners. See Figure 3

Loosen3. Re-set the origin using the procedure above -- “Setting the origin”

Attach…SET

Gauge Head

Deep Hole Extension Rod

Spanner

Figure 3

AttachABS/INC…UNIT

Display Unit

OPERATION
1. Remove any grease and dust from the measuring surfaces with a clean cloth, such as a lens cleaning cloth. Make sure no foreign objects
are adhered to the surfaces.
2. Press the [ …SET ] button to turn on power.
3. Make sure “ABS” is displayed on the LCD; press the [ABS/INC…UNIT] if required.
4. Insert the measurement head into object to be measured and turn ratchet thimble until the measuring surfaces make contact with the inside
diameter. Continue turning until ratchet “clicks” 1~3 times and then read the measurement off the LCD display.

INC ModePress the [ABS/INC…UNIT] button to reset display to zero while retaining the origin setting in memory.
To return to normal (absolute) measurement mode, press the [ABS/INC…UNIT] button again.

TROUBLESHOOTINGERROR CONDITION
Measured value is wrong

CORRECTIVE ACTION● Check if measuring surfaces are dirty. Clean with lens cloth.
● Check to insure origin-point is correct. → refer to section “Setting the origin”

Gauge head does not retract● When stored at low temperature, or not used for a while, the internal grease may become stiff.

Allow sufficient time for grease to warm up.
● Wearing dust-free gloves, use hand to push in.

● Nothing is displayed on LCD● Display is not stable● Display is not clear● Remove and reinsert battery to cycle power.
● Replace the battery.

※If error continues, or if you have any questions, please contact distributor or place of purchase.
※Please note, manufacturer is unable to respond to inquires or provide service directly. Please contact distributor or place of purchase.

CAUTION● Always remove dirt from measuring surfaces with a lens cloth before use.
● Do not turn thimble more than 3mm above upper measurement range.
● This is a precision instrument, handle with care. Do not drop or subject to excessive forces.
● Keep instrument away from direct sunlight or high temperatures such as in a car, or near a stove or heat source.
● Keep instrument away from water and oil.
● Please do not disassemble or modify.
● Remove dust and cutting chips after use and apply rust preventative oil to metallic surfaces. Please keep out ofreach of children.
● When instrument will be idle for one month or more, please remove the battery to prevent damage from battery
fluid leakage.
● Please do not use organic solvents to clean the instrument body.
● Only use as directed. Improper use may cause accident or injury.

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

I224-K1 1612