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OPERATION

TO TIME AN EVENT

1) Press 

to turn on the watch.

2) Press 

to start the timer.

3) Press 

to store a split. The split number will 

increment in 4.

4) Press

TC to change between “LAP” and 

“CUM” display in 1. In "LAP" display, the lap split
(the time between the last two presses of  

)

will be displayed for 8 seconds, after which the
lap split time will start to run again (starting 
from 0:00'08"00). In "CUM" display, the cumula
tive split time will be displayed until the next 
split is stored. You can change between lap and
cum at any time.

5) Press 

TR to stop the timer. The finish time 

and last lap split will be stored in memory.

**  NOTE ** When the timer is stopped, then
restarted, the stop/restart times will NOT be stored.
The split time will be the same as if the timer was
not stopped.

TO TIME ANOTHER EVENT 
(CREATE A NEW SEGMENT) 

To time another event, you may either CREATE A
NEW SEGMENT 
or  CLEAR THE CURRENT
SEGMENT 
(see "To Clear Data"). Creating a new
segment will preserve the data from the event you
have just completed.

1) With the timer stopped, press   

to  create a 

new segment. The next segment number will 
show in  

, and the other windows will show 

0's.

2) Follow steps 2 through 6 of "TO TIME AN 

EVENT" to time a new event and store the 
times in Segment 2.

3) Repeat steps 1 and 2 to create and use new 

segments as desired.

TO RECALL DATA

You may recall data when the timer is running ("on
the fly") or when the timer is stopped. The timer
continues to run internally when  recalling on the
fly. 
When recalling on the fly, you may only review
the segment currently being timed. As you recall
data the split number will be displayed in 

.

1) Recall on the fly

a)  With the timer running, press 

to begin 

memory recall. The most recently stored 
data will be displayed first. Splits will be dis
played in 

. The split number will show in 

. The segment  number will show in 

.

The elapsed time will continue to run in  
Each additional press of 

will step 

through the stored splits in reverse order, i.e.
split 5 - split 4 - split 3 - split 2 - split 1.

b) Press FL to toggle between lap and cum

display of the split shown in 

.

c) Press and hold 

to exit recall OR

d) Press either of the other top buttons ( 

or

) to exit recall AND perform the usual 

function of that button (store split or stop).

TR

TL

TC

1

TC

2

3

4

1

TC

4

3

TL

TR

TL

FL

TL

TR

FR

2) Recall with the timer stopped.

a) With the timer stoped, press 

to begin 

memory recall. The splits from the current
segment will be displayed, starting with 
the segment date and time, followed by 
the first split. The lap split will be dis
played in  

and the cum split in 

. The

segmet number will show in 3. The split 
number will show in 

. You will see the

following screens displayed as you con
tinue to press 

:

b) Press 

to choose another segment 

to recall.

c) Press and hold 

to exit recall.

TO CLEAR DATA

1) To clear the current segment, press and 

hold 

for approximately 3 seconds. The 

watch gives two short and one long beep 
to indicate that the segment has been 
cleared, at which point "CLEAR SEG" will 
be replaced by "CLEAR ALL" on the display.
Release

to avoid clearing all data. The 

watch display will show all 0's and you may 
store new times in that segment.

2) To clear a different segment, press  

to 

enter recall mode, then 

to select the      

segment you wish to clear. Then follow step
1 to clear that segment. If you have lots of 
data stored in the watch, the display will flash
"BUSY" while it reorganizes the  data. The 
display will show all 0's and the next         
available segment number in 

. You may 

now store times in the new segment OR
re-enter memory recall to select a different 
segment to clear.

**  NOTE ** When you have multiple segments
stored in your watch and you clear an interim
segment, the segments stored after the cleared
segment will "drop down" to replace the cleared
segment. For example, if you delete Segment 5,
Segment 6 will move to the Segment 5 position,
Segment 7 will move to the Segment 6 position,
etc. New data will be stored in the next available
segment number.

3) To clear all data from all segments, follow 

step 1 above but CONTINUE holding  
after the first long beep and "CLEAR ALL" 
appears on the display for approximately 3 
MORE seconds (6 seconds total). The watch 
will beep quickly 3 more times then give one
long beep and show all 0's and "SEG 1" in 

. You may release   

at any time before 

the final long beep to avoid clearing all data
in memory.

FL

3

FL

3

TL

TC

FL

FL

TC

TL

TC

4

2

1

TC

TO DISPLAY DATE AND TIME

Press 

and 

together to display the current

date and time, watch ID number, and total used
memory for 5 seconds.

TO ACTIVATE THE BACKLIGHT

The backlight will be activated automatically with
every button press in low light conditions and will
stay on for 2.5 seconds. To activate the backlight
without storing a split or stopping the timer, you
can 

press or .

** NOTE ** The backlit display will be clearest when
the top is tilted slightly away from you. Please keep
this in mind if mounting your watch on a fixed
surface.

TO TURN THE INTERVAL OFF

Press and hold 

to turn the Interval off. To

preserve battery life, the Interval will also turn itself
off after 20 minutes of no activity (timer stopped,
no button presses) or 10 hours of running
unattended (timer running, no button presses). All
memory data will be preserved when the watch is
turned off.

** NOTE ** You must exit the setting routine before
you can turn the Interval off with 

.

TO CHANGE THE BATTERY

The Interval uses two CR2032 lithium cells,
commonly available where watch batteries are
sold. The batteries are stacked one on top of the
other in the battery compartment.

The "top"

battery (closer to the battery door) runs the
backlight; the "bottom" battery (closer to the circuit
board) runs the watch functions.

When the Interval's display grows dim, the watch
battery (bottom) needs to be changed. All memory
data will be lost when you change the battery, so
be sure to record or upload your data when you
notice the display growing dim. When the back-
light no longer illuminates in low light conditions,
the backlight battery (top) needs to be changed.

1) Open the battery compartment with a coin and

tap the back of the watch on your palm to 
remove the batteries.

2) Change the affected battery. ** NOTE ** You 

can use a functioning backlight battery to 
power the watch temporarily by switching the 
positions of the batteries. The backlight will not
illuminate in this situation.

WARRANTY

The Interval is guaranteed against defects in
materials and workmanship for one year from the
date of purchase. The provisions of this warranty
do not apply to batteries or products which have
been subjected to misuse, negligence, accident,
alteration or improper maintenance or repair.

Please call 610-447-1555 or e-mail

[email protected] with problems.

You will also find technical information 

online at www.nkhome.com.

FR

FR

FR

FL

FR

FL

Segment Number with 
Date and Time Started

Stored Splits,
Numbered in Order

Total Time for Segment 
(Same as Stop Time)

Best (Fastest) Split 
Time and Number

Average of all Split Times 
for that Segment

NIELSEN-KELLERMAN

104 West 15th St. Chester, PA 19013

(610) 447.1555 • fax (610) 447.1577

[email protected] • www.nkhome.com

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