EN
Table of Contents
Message Codes - - - - - - - - - - - - - - - - - - - - - - - -14
Care - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -14
Service - United States - - - - - - - - - - - - - - - - -15
Volume- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10
Stake out - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12
Delete Memory - - - - - - - - - - - - - - - - - - - - - - - - - - - 13
Technical Data - - - - - - - - - - - - - - - - - - - - - - - - - 14
Milwaukee 2281-20
1
EN
Instrument Set-up
Introduction
Overview
The safety instructions and the user manual should be
read through carefully before the product is used for the
first time.
Display
The person responsible for the product must ensure that
all users understand these directions and adhere to them.
The symbols used have the following meanings:
ƽWARNING
Indicates a potentially hazardous situation or an unintended use
which, if not avoided, will result in death or serious injury.
On / Measure
ƽCAUTION
Indicates a potentially hazardous situation or an unintended use
which, if not avoided, may result in minor injury and/or appreci-
able material, financial and environmental damage.
Important paragraphs which must be adhered to in practice
Add / Subtract
Area
Memory
Volume
i
as they enable the product to be used in a technically
correct and efficient manner.
Pythagoras /
Stake out
Units
Clear / Off
Measuring
reference
Milwaukee 2281-20
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Instrument Set-up
Display
Insert batteries
Area /
To ensure a reli-
able use, do not
use zinc-carbon
batteries.
Change batter-
ies when battery
symbol is flash-
ing.
Battery
Volume
i
Stake out
Measuring
reference
Memory
Circumfer-
ence
Pythagoras
Wall area
Min/Max
Measuring
Addition /
Subtraction
Units
2nd result
Main line
Milwaukee 2281-20
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Instrument Set-up
Labeling
Laser Radiation
Do not stare into the beam
Laser class 2
acc. IEC 60825-1:2007
Maximum radiant power: <1mW
Emitted wavelength: 620-690nm
Beam divergence: 0.16 x 0.6 mrad
-9
-9
Impulse duration: 0.2 x 10 s - 0.8 x 10 s
Subject to change (drawings, descriptions and technical data)
without prior notice.
Milwaukee 2281-20
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Operations
Switching ON/OFF
Clear
Message Codes
1x
2x
Press ON but-
ton 2 sec to
startcontinuous
laser mode. If
no key is
If the info icon appears with a
number, observe the instruc-
tions in section "Message
Codes".
i
Example:
2 sec
Device is
turned OFF.
pressed for 180
sec, the device
switches off au-
tomatically.
Leave actual
Undo last action.
function, go to de-
fault operation
mode.
Beep ON/OFF
Illumination ON/OFF
2 sec
2 sec
simultaneously
simultaneously
Distance unit setting
Switch between the
following units:
0.000 m 0.00 ft
0.0000 m 0‘00‘‘ 1/32
2 sec
0.00 m
0.00 in
0 in 1/32
Milwaukee 2281-20
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Operations
Adjusting measuring reference / tripod
1
2
Distance is measured
from the tripod thread
permanently.
Distance is measured from the
front of the device.
3
Distance is measured from the rear
of the device (standard setting).
Multifunctional endpiece
The orientation
of the endpiece
isautomatically
detected and
thezeropointis
accordingly ad-
justed.
i
Milwaukee 2281-20
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Measuring Functions
Measuring single distance
Target surfaces: Measuring
errors can occur when meas-
uring to colourless liquids,
glass, styrofoam or semi-per-
meable surfaces or when
aiming at high gloss surfac-
es. Against dark surfaces the
measuring time increases.
1
2
3
i
8.532
m
Aim active laser at target.
Permament / Minimum-Maximum measuring
The minimum and maximum dis-
tance measured is displayed
(min, max.). The last value meas-
ured is displayed in the main line.
min.
max.
1
2
3
2 sec
Stops permanent / mini-
mum-maximum measuring.
Used to measure room diagonals (maximum val-
ues) or horizontal distance (minimum values)
8.532
m
Add / Subtract
2x
The result is shown in the
main line and the measured
value above. This process
can be repeated as required.
The same process can be
used for adding or subtracting
areas or volumes.
1
2
3
i
The next meas-
urementisadded
to the previous
one.
The next meas-
urement is sub-
tracted from the
previous one.
5.51
5 m
7.332
m
12.847
m
Milwaukee 2281-20
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Measuring Functions
Volume
1
2
3
4
5
6
Aim laser at first
target point.
Aim laser at sec-
ond target point.
Aim laser at third
target point.
The result is
shown in the
7
8
main line
i
and the
measured
valueabove.
80.208
Circumference
m
2 sec
2
Ceiling/floor area
208.703
m
3
78.694
m
3
Volume
m
78.694
Milwaukee 2281-20
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Measuring Functions
Pythagoras (2-point)
Notice additional
Pythagoras meas-
urement informa-
tion at the bottom
of the next page.
1
2
3
4
5
i
Aim laser rectan-
gular at lower
point.
Aim laser at up-
per point.
8.294
m
Pythagoras (3-point)
2x
1
2
3
4
5
6
Aim laser at up-
per point.
Aim laser at rec-
tangular point.
Aim laser at lower point.
• Pressing the measuring
key for 2 sec in the func-
tion activates automati-
cally Minimum or
Pythagoras
measurements:
Notice additional Pythagoras
measurement information at the
bottom of the next page.
7
i
i
Maximummeasurement.
8.294
m
Milwaukee 2281-20
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Measuring Functions
Stake out
3x
1
1
2
3
2
3
a
Approve value and
start measurement.
Adjust value
1.01
2 m
b
1.000
m
b
Move device slow-
ly along the stake-
out line. The dis-
tance to the next
stake out point is
displayed.
When approaching a
stake out point to less
than 0.1 m the instrument
starts to beep.
The function can be
stopped by pressing the
CLEAR/OFF button.
4
i
0.625
m
0.240 m is missing
up to next 0.625 m
distance.
0.240
m
Milwaukee 2281-20
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Measuring Functions
Memory (10 last displays)
Delete Memory
1
2
3
2 sec
2 sec
The value from
the main line can
be used for fur-
ther calculations.
10 last displays
are displayed.
10
10
Navigates trough
10 last displays.
simultaneously
8.294
m
Memory is completely de-
leted.
8.294
m
Milwaukee 2281-20
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Technical Data
Message Codes
* applies for 100 % target reflectivity (white painted
wall), low background illumination, 25 ºC
** applies for 10 to 500 % target reflectivity, high back-
ground illumination, - 10 ºC to + 50 ºC
*** Tolerances apply from 0.05 m to 10 m with a confi-
dence level of 95%. The maximum tolerance may
deteriorate to 0.1 mm/m between 10 m to 30 m and to
0.2 mm/m for distances above 30 m
**** applies for 100 % target reflectivity, background
illumination of approximately 30'000 lux
If the message Error does not disappear
after switching on the device repeatedly,
contact the dealer.
If the message InFo appears with a
number, press the Clear button and
observe the following instructions:
Distance measurement
Typical Measuring Tolerance* ± 1.5 mm / 0.06 in ***
Maximum Measuring
Tolerance**
± 2.5 mm / 0.10 in ***
Range of target plate
Typical Range*
60 m / 197 ft
60 m / 197 ft
50 m / 164 ft
Range at unfavourable
condition ****
No.
Cause
Correction
204
Calculation error
Perform measurement
again.
Smallest unit displayed
0.1 mm / 1/32 in
Ø laser point
at distances
6 / 30 / 40 mm
(10 / 50 / 60 m)
252
253
255
Temperature too
high
Let device cool down.
Functions
General
Distance measuring
Min/Max measuring
Permanent measuring
Stake-out
yes
Temperature too
low
Warm device up.
Laser class
Laser type
2
yes
635 nm, < 1 mW
Received signal too Change target surface
weak, measuring
time too long
yes
(e.g. white paper).
Protection class
IP54 (dust- and splash
water protected)
yes
Addition/Subtraction
Area
yes
Autom. laser switch off
Autom. power switch-off
Battery durability (2 x AAA)
after 90 s
256
257
258
Received signal too Change target surface
high
yes
(e.g. white paper).
after 180 s
Volume
yes
up to 5000 measure-
ments
Too much back-
ground light
Shadow target area.
Pythagoras
2-point, 3-point
Dimension (H x D x W)
Weight (with batteries)
117 x 57 x 32 mm
4.6 x 2.4 x 1.3 in
Memory
10 displays
yes
Measurement
outside of meas-
uring range
Correct range.
Beep
0.14 kg / 4.938 oz
Illuminated display
Multifunctional endpiece
yes
Temperature range:
- Storage
260
Laser beam inter-
rupted
Repeat measurement.
yes
-25 to 70 °C
-13 to 158 °F
-10 to 50 °C
14 to 122 °F
- Operation
Care
• Clean the device with a damp, soft cloth.
• Never immerse the device in water.
• Never use aggressive cleaning agents
or solvents.
Milwaukee 2281-20
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Service - United States
MILWAUKEE prides itself in producing a Contact our Corporate After Sales
premium quality product that is Nothing
Service Technical Support about ...
• Technical Questions
• Service/Repair Questions
• Warranty
But Heavy Duty®.
Your satisfaction with our products is very
important to us!
If you encounter any problems with the
operation of this tool, or you would like to
locate the factory Service/Sales Support
Branch or authorized service station
nearest you, please call...
Additionally, we have a nationwide
network of authorized Distributors ready to
assist you with your tool and accessory
needs.
Check your “Yellow Pages” phone direc-
tory under “Tools-Electric” for the names &
addresses of those nearest you or see the
'Where To Buy' section of our website.
call: 1-800-SAWDUST
fax: 1.800.638.9582
email:
Register your tool online at
• receive important notifications regarding
your purchase
• ensure that your tool is protected under
the warranty
• become a Heavy Duty club member
1-800-SAWDUST
(1.800.729.3878)
Monday-Friday
7:00 AM - 6:30 PM
Central Time
or visit our website at
For service information, use the 'Service
Center Search' icon found in the 'Parts &
Service' section.
Milwaukee 2281-20
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