
SPECIFICATIONS
Timing Capacity: 19 hours 59 minutes
Timing Increments: 1 minute (Countdown)
1 second (Count-Up)
Timing Accuracy: 0.01%
COUNTDOWN ALARM OPERATION
1. Reset the display to 0:00 by pressing the
H and M buttons simultaneously.
2. Press the H button for the number of hours
desired.
Press the M button for the number of
minutes desired.
(To rapidly scroll the hours or minutes hold
down the H button or M button.)
3. Once the desired time is displayed, press
the ST button to start the countdown alarm
operation. The blinking colon (:) indicates
the time is running.
4. To pause the countdown alarm operation,
press the ST button. The non-blinking
colon (:) indicates the timing has been
stopped. To resume timing, press the ST
button again.
5. Once zero is reached, the alarm will sound
for approximately 60 seconds, and then
turn off automatically.
To turn off the alarm manually, press the
H and M buttons simultaneously.
REPEAT COUNTDOWN
When the countdown alarm is sounding,
pressing the ST button will silence the alarm,
recall the last countdown time and begin
countdown timing. (Any number of repeat
countdowns may be performed.)
COUNT-UP (STOPWATCH) OPERATION
1. Reset the display to 0:00 by pressing the
H and M buttons simultaneously.
2. Press ST button to start the count-up
stopwatch operation.
3. Press the ST button again if a time-out
reading is desired.
4. Press the ST button again to resume
timing.
ALL OPERATIONAL DIFFICULTIES
If this timer does not function properly for any
reason, replace the battery with a new highquality battery (see “Battery Replacement”
section). Low battery power can
occasionally cause any number of “apparent”
operational difficulties. Replacing the battery
with a new fresh battery will solve most
difficulties.

BATTERY REPLACEMENT
A faint display, no display, or operational
difficulties indicate that the battery should be
replaced. Remove the battery cover, located
on the back of the unit, by sliding it down and
lifting it out. Replace the battery with a new
1.5-volt, G-13 size silver-oxide battery.
Equivalent battery replacements are:
RAYOVAC RW42, DURACELL D357, and
EVEREADY 357. Insert the battery with the
positive side facing out. Replace the battery
cover.
KEY-CHAIN TIMER
INSTRUCTIONS
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
©2017 92-5041-40 Rev.
0 072617