AMES 64021 Assembly instructions

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Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference. 18k
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright© 2018 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
To ol s r eq ui r ed f o r as s em bl y a nd se rvice m a y not be i nc luded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

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Safety ..........................................2
Specifications ..............................5
Setup ...........................................6
Operation .....................................8
Maintenance ...............................15
Warranty .....................................16
QFKMLMR%EHNSITE%FMU%U6;LMLGLIME
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety messages
that follow this symbol to avoid possible injury or death.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.

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K*,9%,77%#,2*$V%),(8"83#%,89%,77%"8#$('4$"&8#1%%
Failure to follow the warnings and instructions may result
in electric shock, fire and/or serious injury.
E,W*%,77%),(8"83#%,89%"8#$('4$"&8#%2&(%2'$'(*%(*2*(*84*1
1. Electrical shock can cause death
or injury! NEVER TOUCH exposed
conductors of electricity.
2. G*#$%4,+7*%W&7$,3*#%)"$.%4,(*1
3. Inspect the Multimeter before
use. In addition to a general
inspection, look specifically for:
a. Pay special attention to the
insulation protecting the connectors.
b. Check the leads for exposed metal,
damaged insulation, and continuity.
c. Replace damaged test lead
immediately, before use.
4. Do not use the Multimeter if:
a. Either of the test leads are
damaged in any way.
b. Test leads are dirty or
have residue on them.
c. The battery is low.
d. Near any explosive
gasses or fumes.
e. Any abnormal operation is
detected.
(If in doubt about the
condition of the Meter, have
it serviced before use.)
f. The battery cover is open.
5. Power this Meter using only
the battery(ies) referenced in
the Specifications Chart.
6. Use caution when working near
voltages above 30 VAC rms, 42 VAC
peak, or 60 VDC. Voltages this high
present a risk of electric shock.
7. Disconnect the circuit’s power
before connecting the Meter in
series, when measuring current.
8. Connect the common (COM) test
lead first and disconnect it last.
9. Hold the probes with fingers
behind guards.
10. Avoid electrical shock. Use extreme
caution when working near uninsulated
conductors or bus bars. Prevent body
contact with grounded surfaces such
as pipes, radiators, ranges, and cabinet
enclosures when testing voltages.
11. Observe work area conditions. Do
not test voltages in damp or wet
locations. Don’t expose to rain.
Keep work area clean and well lit.
12. Keep children away. Children must
never be allowed in the work area.
13. Stay alert. Watch what you are doing,
use common sense. Do not operate
any meter when you are tired.
14. Do not operate meter if under the
influence of alcohol or drugs. Read
warning labels on prescriptions to
determine if your judgment or reflexes
are impaired while taking drugs. If there
is any doubt, do not operate the meter.

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15. People with pacemakers should
consult their physician(s) before use.
Electromagnetic fields in close
proximity to heart pacemaker could
cause pacemaker interference
or pacemaker failure.
16. Do not test voltage on circuits
higher than 1000 volts.
17. Do not test current on circuits
higher than 10 amps.
18. Dress properly. Protective,
electrically nonconductive
clothes and nonskid footwear are
recommended when working.
19. Wear ANSI-approved safety
goggles during use.
20. Only use accessories intended
for use with this meter.
21. Avoid damaging meter. Use only
as specified in this manual.
22. Prior to testing resistance, diodes,
or continuity; disconnect all power
to the circuit and discharge all
high-voltage capacitors.
23. Performance of this meter may vary
depending on battery condition.
24. Use the proper settings, terminals,
techniques, and range for the
tests performed. Start with the
range stated in the instructions.
25. Do not apply voltage to the
Test Leads when the Multimeter
is in the Ohms testing setting.
Damage can occur to the Meter.
26. Do not switch between testing
modes with the multimeter
connected to a circuit.
27. Do not use the meter at a setting
marked as blank on the scale.
28. Have the Multimeter calibrated by
a qualified technician every year
to maintain accurate results.
29. Do not disassemble charger;
take it to a qualified technician
when service or repair is required.
Incorrect reassembly may result
in a risk of electric shock or fire.
30. The warnings, cautions, and
instructions discussed in this
instruction manual cannot cover all
possible conditions and situations
that may occur. It must be understood
by the operator that common sense
and caution are factors which cannot
be built into this product, but must
be supplied by the operator.
%EF!6%GX6E6%LMEGKPOGLIME1

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DC Voltage Ranges: 60mV / 600mV / 6V / 60V / 600V / 1000V
DC Voltage Accuracy (@60mV - 600mV) ± 0.8% of rdg + 3D
(@6V - 600V) ± 0.5 of rdg + 1D
(@1000V) ± 1.0% of rdg + 3D
DC Current Ranges: 600μA / 6000μA / 60mA / 600mA / 6A / 10A
DC Current Accuracy (@600μA - 600mA) ± 1.0% of rdg + 3D
(@6A - 10A) ± 1.2% of rdg + 5D
AC Voltage Ranges: 60mV / 600mV / 6V / 60V / 600V / 750V
Frequency Range: 45Hz ~ 1kHz
AC Voltage Accuracy (@60mV - 600mV) ± 1.2% of rdg + 5D
(@6V - 600V) ± 1.0% of rdg + 3D
(@750V) ± 1.2% of rdg + 5D
AC Current Ranges: 600μA / 6000μA / 60mA / 600mA / 6A / 10A
Frequency Range: 45Hz ~ 1KHz
AC Current Accuracy (@600μA - 6000μA) ± 1.2% of rdg + 5D
(@60mA - 600mA) ± 1.5% of rdg + 5D
(@6A - 10A) ± 2.0% of rdg + 5D
Resistance Ranges: 600Ω / 6kΩ / 60kΩ / 600kΩ / 6MΩ / 60MΩ
Resistance Accuracy (@600Ω) ± 1.2% of rdg + 2D
(@6k - 600kΩ) ± 1.0% of rdg + 2D
(@6MΩ) ± 1.2% of rdg + 2D
(@60MΩ) ± 1.5% of rdg + 2D
Capacitance Ranges: 40nF / 400nF / 4μF / 40μF / 400μF / 4000μF
Capacitance Accuracy (@40nF - 40μF) ± 3.0% of rdg + 5D
(@400μF) ± 4.0% of rdg + 5D
Diode Open circuit voltage ~2.8V
Continuity Meter beeps at < 10Ω
Frequency Range: 10Hz - 10MHz
Frequency Accuracy (@10Hz to - 10MHz) ± 0.1% + 4D
Temperature Range: -40°F - 1832°F (-40°C - 1000°C)
Temperature Accuracy (@ -40°F - 4°F) -8% of rdg + 6D
(@>4°F - 32°F) ± 1.2% of rdg + 5D
(@>32°F - 212°F) ± 1.2% of rdg + 4D
(@>212°F - 1832°F) ± 2.5% of rdg + 3D
Duty Cycle 1% - 99%
Operating Temperature Range: 32°F - 104°F
Overload Protection (mAμA Jack) 600mA/1000V Ø6.35×31.8mm fuse (F1)
(10A Jack) 10A/1000V Ø10.3×38mm fuse (F2)
Display LCD
Battery 9V (included)

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FO=% % Alternating current
UO=% % Direct current
Indicates that display data is being held
Auto Power-Off
F'$&(,83*=%FPGI Auto range mode (Meter selects the
range with the best resolution)
NFMP Manual range selection mode
Continuity
Diode test
K6T=% Relative measurement mode
NF` The maximum value is being measured
NLM The minimum value is being measured
Battery low
aPercent (Duty cycle)
bO=%b; Celsius / Fahrenheit (Temperature)
kΩ, Ω Kilohms, Ohms (Resistance)
5;=%;=% % Millifarads, Farads (Capacitance)
5!=%! Millivolts, Volts (Voltage)
5F=%F Milliamperes, Amperes (Current)
[X\=%X\ Kilohertz, Hertz (Frequency)
n, μ, m Unit of measurement: Nano, Micro, Milli
[=%N Unit of measurement: Kilo, Mega
Sleep mode
IT Value too large for the selected range
?Negative reading
Bar graph

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KFMR6%S'$$&8
The KFMR6 Button enables manual selection of available ranges for the selected
function. The Meter’s default is F'$&(,83*%]FPGI^%where the Meter selects for you1
1. To select manual ranging mode, hold
down KFMR6%Button until the Meter
beeps. The Meter is in manual mode
when NFMP is seen on the Display.
2. Each press of the KFMR6 Button
steps through the ranges available
for the selected function.
3. To return to Autorange, hold down
the KFMR6 Button for about 2
seconds or until the Meter beeps.
The Meter is in Autorange when
FPGI is seen on the Display.
NF`%NLM%S'$$&8
The NF`%NLM Button allows you to record, temporarily store and
view signal events as you monitor them. You may record while in
any range or mode except Hz% (frequency/duty cycle).
1. Press the NF`%NLM (maximum/
minimum) Button to begin
recording. Note that the Meter
automatically resets to manual
range mode when measuring
minimum / maximum values.
2. When you are finished recording,
press the NF`%NLM Button to scroll
through the high (maximum) and low
(minimum) recorded readings. The
readings will be seen on the Display.
3. To return to normal operating
mode, hold down the NF`%NLM
Button for about 2 seconds.
K6T% %S'$$&8
The K6T (relative mode) Button can be used in all modes except Hz%
(frequency/duty cycle). Relative mode subtracts a stored value from the present
measurement and displays the result. For example, if the stored value is 20.0V
and the present measurement is 22.0V then the Meter will display 2.0V.
1. To enter relative mode, press the
K6T Button. The present
measurement will lock and
the Meter will display “0”.
2. Take a new measurement and the
Meter will display the relative value.
3. Press the K6T Button again to reset
the stored value and exit relative mode.

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The X\a (frequency/duty cycle) Button allows you to measure the frequency
and duty cycle (the ratio of time a load or circuit is on verses off) of a signal.
1. To measure the frequency/duty cycle,
press the X\a Button. Frequency (Hz)
is the default measurement mode.
2. To measure U'$V%OV47*,
press the X\a Button again
to select a measurement.
3. To exit the frequency/duty
cycle measuring mode,
press the X\a Button.
XITU%0%TLRXG%S'$$&8
The XITU0TLRXG Button has two functions: To hold the present
reading on the Display and to turn on the Display’s backlight.
1. To activate XITU, hold down the
XITU0TLRXG Button until the
meter beeps and the %symbol
appears on the Display.
2. When in XITU mode, the present
reading will be held on the Display.
3. To exit HOLD, hold down the
XITU0TLRXG Button until the
meter beeps and the %symbol
disappears from the Display.
M&$*- The Hold mode will not capture
unstable or noisy readings.
4. To turn on the Display’s backlight,
hold down the XITU0TLRXG
Button for about 2 seconds.
5. The backlight will automatically
turn off after about 10 seconds.
M&$*- Frequent use of the backlight
shortens the life of the battery(ies). Only
use the backlight when necessary.
S7'*%S'$$&8
The Blue Button is used to enable available modes for a selection on the Rotary Switch.
F'$&%J&)*(?I22% %,89%E7**/%N&9*%
If the Meter is not used for approximately 15 minutes, it automatically
turns itself off to conserve battery power. The Meter’s default is enabled
F'$&%J&)*(?I22%which is indicated by appearing on the Display.
1. E7**/%N&9* is active when
is seen on the display.
2. To turn the Meter back on after
auto power-off, press any Button
or turn the Rotary Switch.
3. To disable F'$&%J&)*(?I22, hold down
the S7'* Button while turning on the
Meter. The symbol will not display
when Auto Power-Off is disabled.
S,(%R(,/.
The bar graph updates faster than the digital display. This can be used
for monitoring changes in measurements at a higher sampling rate.
The bar graph indicates polarity (?) and overload ( IT).

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M&$*- Remove plugs from
ends of Test Leads (included)
before connecting to Meter.
M&$*- Test Lead probes have
removable covers for overvoltage
protection. With covers in place, Test
Leads are rated for use with CAT III
and CAT IV circuits. Exposed probes
are rated for use with CAT II circuits.
FO0UO%!&7$,3*%N*,#'(*5*8$
Measure AC conductors carrying up to 750 VAC, 45Hz ~ 1kHz.
Measure DC conductors carrying up to 1000 VDC.
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1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\ L8/'$ Jack.
2. Turn Rotary Switch to the !%
X\%a or
5!%
X\%a %position, as appropriate.
3. Press S7'* Button to choose
AC or DC voltage.
4. Carefully touch exposed
conductors with tips of probes.
5. Read measured voltage on the Display.
6. Press X\a to obtain frequency
and duty cycle value.
7. When testing is complete, turn
Rotary Switch to I;;, remove
Test Leads and store with Meter.
;(*<'*84V0U'$V%OV47*%N*,#'(*5*8$
Measure a signal’s duty cycle and frequency from 10Hz to 10MHz.
1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\%L8/'$ Jack.
2. Turn the Rotary Switch to the X\a%
position. Frequency (Hz) is the
default measurement mode.
3. Connect the Test Leads across
the circuit to be measured.
4. Read measured frequency
on the Display.
5. To measure U'$V%OV47*, press the
X\a Button to select a measurement.
6. When testing is complete, turn
Rotary Switch to I;;= remove
Test Leads%and store with Meter.

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Measure temperature from -40°F to 1832°F (-40°C to 1000°C).
1. Connect red (+) end of Thermocouple
(included) to the !ΩX\%L8/'$
Jack and the black (-) end to
the mAμA%L8/'$%Jack.
2. Turn Rotary Switch to the bOb;%
position. The Display will show the
current ambient temperature.
3. Press S7'* Button to switch
between Celsius and Fahrenheit.
4. Touch the tip of the Thermocouple
to the object being tested.
5. After a few seconds the measured
temperature will display.
6. When testing is complete, turn
Rotary Switch to I;;, remove
Thermocouple and store with Meter.
M&$*- To avoid measurement errors at
very low temperatures, the operating
temperature must not exceed 10~28°F1
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Measure resistance up to 60M Ohms.
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M&$*- When measuring Ohms,
start with the lowest range if the
resistance is unknown.
1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\ L8/'$ Jack.
2. Turn the Rotary Switch to
the position.
3. Press Blue Button until the Display
indicates Ohms Ω is being measured.
4. Carefully touch exposed
conductors with tips of probes.
5. Read measured resistance
on the Display.
6. When testing is complete, turn
Rotary Switch to I;;, remove
Test Leads and store with Meter.
M&$*- Sometimes the resistor value and
measured resistance differ. This is due
to the Meter’s output test current going
through all possible paths between leads.
• Keep test leads as
short as possible.
• Resistors should be
measured out of circuit.
M&$*- For resistance measurements
above 1MΩ, allow a few seconds
to get a steady reading.
M&$*- When leads are disconnected
or measurement is out of
range, IT is displayed.

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Test continuity between two points in a circuit.
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1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\ L8/'$ Jack.
2. Turn the Rotary Switch to
the position.
3. Press S7'* Button until is displayed.
4. Connect the test leads across
the circuit to be measured.
5. Read measured resistance on the
Display. If the measured resistance
is less than 10Ω, Meter will beep.
6. When testing is complete, turn
Rotary Switch to I;;, remove
Test Leads and store with Meter.
M&$*- If Test Leads are open or the
resistance is out of range, IT is displayed.
The buzzer does not sound if the
resistance is greater than 100Ω.
U"&9*%N*,#'(*5*8$
Test voltage drop in diodes.
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1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\ L8/'$ Jack.
2. Turn the Rotary Switch to
the position.
3. Press S7'*%Button until
is displayed.
4. Connect red probe to diode’s anode
and black probe to the cathode.
5. Read measured forward-biased
voltage drop on the Display.
M&$*- In a circuit, a good diode will produce
a forward voltage drop of 0.5V to 0.8V.
M&$*- IT is displayed if the Test Leads
are reversed, the diode is open, or
the measurement is out of range.
6. When testing is complete, turn
Rotary Switch to I;;, remove
Test Leads and store with Meter.

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Measure capacitors up to 4000μF.
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1. Plug black test lead into OIN Jack.
Plug red test lead into
!ΩX\ L8/'$ Jack.
2. Turn the Rotary Switch to
the position.
3. Press S7'*%Button until
8; is displayed.
4. Press the K6T%button to zero
out reading as necessary.
5. Carefully touch capacitor
leads with tips of probes.
6. Read measured capacitance
on the Display.
M&$*- If the measurement is out
of range, IT is displayed.
7. When testing is complete, turn
Rotary Switch to I;;, remove
and store capacitor and Meter.

Page 14 ;&(%$*4.8"4,7%<'*#$"&8#=%/7*,#*%4,77%>?@@@?@AA?BCDC1 Item 64021
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Measure AC and DC circuits and conductors carrying up to 10 amperes.
M&$*- Amperage is always tested
in series with circuit under test.
M&$*- When using manual range
mode, always start with the highest
range if the amperage is unknown.
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1. Turn the Rotary Switch to the
appropriate position, depending on the
amperage of the circuit under test.
• Selections are:
μA X\%a microamperes,
5F% X\%a milliamperes,
F% X\%a Amperes.
2. Always start with the highest range
if the amperage is unknown.
3. G'(8%&22%/&)*(%$&%$.*%4"(4'"$%,89
,77&)%4,/,4"$&(#%$&%9"#4.,(3*.
4. Press S7'* Button to select AC
or DC current. The Meter default
is DC current measurement.
5. Break the circuit and connect the
Test Leads in series with the circuit
being measured. Connect the black
lead on the lower voltage side.
• Plug black test lead
into OIN Jack.
• If amperage is < 600mA, plug
red test lead into mAμA Jack.
• If amperage is > 600mA, plug
red test lead into >_F Jack.
6. Power on the circuit and
read measurement.
• Switch to lower ranges,
as necessary, to get the
most accurate reading.
• If “OL” is displayed the
measurement exceeds the current
range. Switch to a higher range.
7. Press X\a to obtain frequency
and duty cycle value.
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8. When testing is complete,
reconnect the circuit, turn
Rotary Switch to I;;, remove
Test Leads and store with Meter.

Page 15;&(%$*4.8"4,7%<'*#$"&8#=%/7*,#*%4,77%>?@@@?@AA?BCDC1Item 64021
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1. Wipe unit with a dry, lint-free cloth.
Do not use solvents or abrasives.
2. Remove battery if not in
use for long periods.
3. Store unit in a dry location.
4. Other than the battery and fuses,
there are no replaceable parts
in this unit. K*/,"(#%#.&'79%+*%
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If the sign appears on the Display,
the battery should be replaced.
1. Remove Test Leads from the Meter.
2. Power off Meter and turn it over.
3. Remove screw(s). Remove tilt
stand and battery cover.
4. Replace S,$$*(V.
a. Remove battery from the
battery compartment.
b. Replace battery with the
same type and rating.
M&$*- Do not reverse the
polarity of the battery.
5. Replace ;'#*]#^.
a. Remove screw(s) from case bottom
and separate case top from bottom.
b. Carefully remove fuses one at a
time. Gently pry one end loose
and remove from its bracket.
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c. Replace with new fuse of the
same type and rating.
6. Rejoin the tilt stand, battery
cover and case bottom.
Reinstall and tighten screw(s).
O,7"+(,$"&8
Have the Meter calibrated by a qualified technician every year.

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Harbor Freight Tools Co. makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase.
This warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence
or accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to you.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation
charges prepaid. Proof of purchase date and an explanation of the complaint must accompany
the merchandise. If our inspection verifies the defect, we will either repair or replace
the product at our election or we may elect to refund the purchase price if we cannot readily
and quickly provide you with a replacement. We will return repaired products at our expense,
but if we determine there is no defect, or that the defect resulted from causes not within
the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
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M&$*- If product has no serial number, record month and year of purchase instead.