DISPLAY                                                  Alarm Bell 
USER GUIDE 
 
 
 
 
Model 365510 
Digital Stopwatch 
 
 
 
 
 
 
 
 
Introduction 
Congratulations on your purchase of the Extech 365510 Digital Stopwatch with Split Time, 
Two Competitor monitoring, Alarm and Clock features. The accuracy of the clock is ±3 
seconds per 24 hours. Careful use of this stopwatch will provide years of reliable service. 
Operation 
NORMAL MODE 
 1.  In Normal Mode the Hours/Minutes/Seconds and the day of week is displayed. 
 2.  Press and hold the SPLIT/RESET button to view the Alarm Time. 
 3.  To turn the Alarm ON or OFF, press the START/STOP button while holding down 
the SPLIT/RESET button (the bell icon in the upper right-hand corner of the 
display is on when the Alarm is turned ON). 
 4.  Press and hold START/STOP to view the calendar month and date. 
 
STOP WATCH MODE (To access, press the MODE button once from Normal Mode) 
When the Stopwatch Mode is first accessed, the SU-FR-SA icons will flash. 
 
A. Elapsed Timer 
1. Press Start/Stop to Start (SU-SA icons flash) 
2. Press Start/Stop to Stop (SU-FR-SA icons flash) 
3. Press Start/Stop Restart 
4. Press Start/Stop to Stop 
5. Press Split/Reset to reset the display. Press MODE to return to Normal Mode. 
 
B. Split Time 
1. Press Start/Stop to Start (SU-SA icons flash) 
2. Press Split/Reset to Split (SU-TH-SA icons flash) 
3. Press Split/Reset to release Split (SU-SA icons flash) 
4. Press Start/Stop to Stop (SU-FR-SA icons flash) 
5. Press Split/Reset to reset the display. Press MODE to return to Normal Mode. 
 
C. Two Competitor Timer 
1. Press Start/Stop to Start (SU-SA icons flash)  
2. Press Split/Reset to Split (SU-TH-SA icons flash) 
3. Press Start/Stop to Stop (SU-TH-FR-SA icons flash) 
4. Press Split/Reset to release Split (SU-FR-SA icons flash) 
5. Press Split/Reset to reset the display. Press MODE to return to Normal Mode. 
NOTE: Press all three buttons simultaneously to reset to the Elapsed Timer mode. 
 
SETTTING DATE AND TIME (To access, press MODE button 3 times from Normal Mode) 
Press SPLIT/RESET to scroll through the programmable digits fields. The flashing digit 
is the digit that is ready to be edited. Use the  START/STOP button to edit the flashing 
digit.  When  setting  the  hours,  minutes,  and  seconds  you  can  press  START/STOP  to 
reset the selected digit to zero; press and hold it down to quickly scroll. The hour digits 
will  scroll  through  A  (for  AM),  P  (for  PM)  and  H  (for  24  hour  clock).  Press  MODE  to 
return to normal operation. 
 
ALARM SET (To access, press MODE twice from the Normal Mode) 
1. Once ALARM SET mode is accessed the hour indicator and MO icon will flash. 
2. Press STOP/START to change the hour. This step also activates the alarm and displays the 
alarm indicator icon (bell in upper right-hand corner of LCD display). 
3. Press SPLIT/RESET to select minutes. 
4. Press STOP/START to advance the minutes. 
5. Press MODE to save alarm setting and to return to time display. 
6. To enable the Alarm, follow the instructions in step 3 of the Normal Mode section. Note that 
the Alarm time setting will reflect the AM, PM, or H mode programmed above in the 
SETTING DATE AND TIME section. 
 
 
ALARM SNOOZE and ALARM SILENCE 
When the alarm sounds, press START/STOP. A 5-minute snooze period will begin. To 
silence the alarm without snooze, press SPLIT/RESET after the alarm sounds. 
 
HOUR CHIME (stop watch beeps once every hour on the hour) 
To set the Hour Chime ON, press and hold SPLIT/RESET then press MODE (while 
continuing to hold SPLIT/RESET) until the days of the week appear on the top of the 
LCD. To turn Hour Chime OFF press MODE (while continuing to hold the SPLIT/RESET 
button) until the days of the week switch OFF. 
Battery Replacement 
This Stopwatch uses an LR-44 or A-76 alkaline button battery. The Phillips head screws on 
the rear of the watch must be removed to open the watch and access the battery. It is 
recommended that a qualified technician replace battery. Battery life is typically one year. 
Calibration Services 
Extech offers repair and calibration services for the products we sell. Extech also provides NIST 
certification for most products. Call the Customer Service Department for information on 
calibration services available for this product. Extech recommends that annual calibrations be 
performed to verify meter performance and accuracy. 
Warranty 
FLIR ExtechSystems,Inc.warrantsthis Instrumentsbranddeviceto             be free of defects in parts and workmanship for oneyear from date of
shipment(asixmonthlimitedwarrantyapplies If necessarytosensorsandcables). itshouldbecome to thereturn instrumentforserviceduring
orbeyondthewarranty               period, contact the Customer Service Department for authorization. Visit the website www.extech.com for contact
information. A ReturnAuthorization number(RA) mustbe anyissuedbefore productis isreturned.Thesender responsibleforshippingcharges,
freight,insurance not apply actionand damageproperpackagingtoprevent intransit.Thiswarrantydoes  todefectsresultingfrom oftheuser
suchasmisuse,improperwiring,operationoutside           of specification, improper maintenance or repair, or unauthorized modification. FLIR Systems,
Inc. notspecificallydisclaimsanyimpliedwarranties andormerchantability fororfitness  a specificpurpose will be anyliablefor direct,indirect,
incidentalor ofconsequentialdamages. repairFLIR’stotalliabilityislimitedto or replacement theproduct.Thewarrantysetforthaboveis
inclusiveand no otherwarranty,whetherwrittenor oral, or isexpressed implied.
 
 
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