22-811
AO0070AAA1
12A01
Printed in China
RadioShack Corporation
Fort Worth, Texas 76102
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The meter can measure frequency from 10 
Hz to 4 MHz and a duty cycle with a signal 
frequency from 10 Hz to 100 kHz. The 
amplitude of a signal is not larger than 10V 
peak.
1. Rotate the function selector to 
Hz/Duty
.
2. To select the frequency function, 
repeatedly press 
SELECT
 until 
Hz
, 
kHz
, 
or 
MHz
 appears.
3. Press 
RANGE
 to manually select the 
range, then repeatedly press 
RANGE
 
until the desired range appears.
4. To select the duty cycle function, 
repeatedly press 
SELECT
 until 
%
 
appears.
5. Connect the black test probe to a ground 
reference for the signal, and connect the 
red test probe to the signal source.
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You can use this feature to detect the 
presence of AC voltage in places such as an 
AC power cord. This lets you easily detect a 
break in an electric circuit or locate the 
source of an electric field.
Note: 
Varying construction materials and 
methods give unreliable results for 
measuring an electric field behind a wall. Do 
not attempt to measure voltage on in-wall or 
other premises wiring.
1. Rotate the function selector to 
EF
.
2. Remove the test leads.
3. Hold the meter so the built-in antenna 
(inside the top of the meter) is near the 
object you wish to examine. Do not 
touch the meter to the object being 
tested. 
Note:
 For the best sensitivity, hold the 
meter behind the function selector.
If the meter detects an electrical field, 1 to 5 
bars appear on the display (corresponding to 
the strength of the field), and the meter 
buzzes. 
EF
 appears but no bars appear if the 
electrical field is weak.
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Keep the meter dry; if it gets wet, wipe it dry 
immediately. Use and store the meter only in 
normal temperature environments. Handle 
the meter carefully; do not drop it. Keep the 
meter away from dust and dirt.
Modifying or tampering with the meter’s 
internal components can cause a malfunction 
and might invalidate its warranty. If your 
meter is not performing as it should, take it to 
your local RadioShack store for assistance. 
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To keep the meter looking new, occasionally 
wipe it with a cloth lightly dampened with 
water. Do not use harsh chemicals, cleaning 
solvents, or strong detergents to clean the 
meter.
WARNINGS:
• Do not let any water drip inside the 
meter while cleaning it.
• Make sure that the meter is completely 
dry before using it.
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If the meter does not work, you might need to 
replace the fuse with the spare fuse we have 
included with your meter. The spare fuse is 
inserted into plastic holder on the top cabinet 
near the terminals.
The fuse is a 500mA, 250V ceramic fuse 
(Cat. No. 27-1070).
Caution: 
 Do not use a fuse with ratings 
other than those specified here. Doing so 
might damage your meter.
1. If the meter is on, rotate the function 
selector to 
OFF
 to turn it off. Then 
disconnect the test leads if they are 
connected.
WARNING:
 To avoid electric shock, you 
must disconnect the test leads before 
you remove the battery cover and back 
cover.
2. Use a Phillips screwdriver to loosen the 
battery cover’s screw, then lift off the 
battery cover.
3. Remove the battery.
4. Use a Phillips screwdriver to loosen the 
screws in the back cover and lift off the 
cover.
Caution:
 The battery line connects the 
back cover and the top cabinet together. 
Do not try to remove the back cover.
5. To remove the fuse, gently pull the red 
ribbon holding it. The fuse pops out.
6. If the fuse is blown, discard it and save 
the ribbon. Then remove the spare fuse 
from the plastic holder and insert it into 
the fuse holder through the loop of the 
attached ribbon.
7. Replace the back cover and secure it 
with the screws.
8. Install the battery (see “Installing a 
Battery” on Page 3).
9. Replace the battery cover and secure it 
with the screw.
WARNING:
 Do not operate your meter until 
the back cover is in place and secured.
Limited Ninety-Day Warranty
This product is warranted by RadioShack against manufacturing
defects in material and workmanship under normal use for
ninety (90) days from the date of purchase from RadioShack
company-owned stores and authorized RadioShack franchisees
and dealers. EXCEPT AS PROVIDED HEREIN, RadioShack
MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED
WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED
IN DURATION TO THE DURATION OF THE WRITTEN LIM-
ITED WARRANTIES CONTAINED HEREIN. EXCEPT AS PRO-
VIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR
RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON
OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR
DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR
PERFORMANCE OF THE PRODUCT OR ARISING OUT OF
ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT
LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR
PROFIT OR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow limitations on how long an implied war-
ranty lasts or the exclusion or limitation of incidental or conse-
quential damages, so the above limitations or exclusions may
not apply to you.
In the event of a product defect during the warranty period, take
the product and the RadioShack sales receipt as proof of pur-
chase date to any RadioShack store. RadioShack will, at its op-
tion, unless otherwise provided by law: (a) correct the defect by
product repair without charge for parts and labor; (b) replace the
product with one of the same or similar design; or (c) refund the
purchase price. All replaced parts and products, and products
on which a refund is made, become the property of RadioShack.
New or reconditioned parts and products may be used in the
performance of warranty service. Repaired or replaced parts
and products are warranted for the remainder of the original
warranty period. You will be charged for repair or replacement of
the product made after the expiration of the warranty period.
This warranty does not cover: (a) damage or failure caused by
or attributable to acts of God, abuse, accident, misuse, improper
or abnormal usage, failure to follow instructions, improper instal-
lation or maintenance, alteration, lightning or other incidence of
excess voltage or current; (b) any repairs other than those pro-
vided by a RadioShack Authorized Service Facility; (c) consum-
ables such as fuses or batteries; (d) cosmetic damage; (e)
transportation, shipping or insurance costs; or (f) costs of prod-
uct removal, installation, set-up service adjustment or reinstalla-
tion.
This warranty gives you specific legal rights, and you may also
have other rights which vary from state to state.
RadioShack Customer Relations, 200 Taylor Street, 6th Floor, 
Fort Worth, TX 76102
12/99