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Celsius, slide the °C/°F button to the desired position.

DISPLAYING PROBE 1 OR PROBE 2

Slide the PROBE switch to the desired position (1 or 2) to 

display the desired temperature sensor readings.

MINIMUM AND MAXIMUM MEMORY

There are four points that are automatically recorded into 

memory:

 • 

Minimum (MIN) Probe 1 (P1) Temperature

    Achieved with time-of-day and date achieved

 • 

Maximum (MAX) Probe 1 (P1) Temperature

    Achieved with time-of-day and date achieved

 • 

Minimum (MIN) Probe 2 (P2) Temperature

    Achieved with time-of-day and date achieved

 • 

Maximum (MAX) Probe 2 (P2) Temperature

    Achieved with time-of-day and date achieved

Minimum and maximum temperature memories 

are NOT programmable.

  The minimum temperature 

recorded into memory is the minimum temperature 

achieved since the last time the memory was cleared.  

The maximum temperature recorded into memory is 

the maximum temperature achieved since the last time 

the memory was cleared.  The minimum and maximum 

temperature memories are maintained over the period 

since the memory was cleared.
Minimum and maximum memories are recorded for both 

sensors regardless of the display mode.

VIEWING MIN/MAX MEMORY

1.  Slide the PROBE switch to the desired position (1 or

  2) to display the desired temperature sensor readings.

2.  Slide the DISPLAY switch to the MIN MAX position.

  The display will show the current temperature and

  minimum/maximum memory for the selected probe.

VIEWING MIN/MAX MEMORY DATE/TIME

1.  Slide the PROBE switch to the desired position (1 or

  2) to display the desired temperature sensor readings.

2.  Slide the DISPLAY switch to the MIN MAX position.

  The display will show the current temperature and

  minimum/maximum memory for the selected probe.

3.  Press the EVENT DATE TIME button, the minimum 

  temperature achieved by that probe along with the

  time-of-day/date the temperature was achieved will

  appear on the display (indicated by MIN and TIME 

  appearing on the display).  

4.  Press the EVENT DATE TIME button a second time,

  the maximum temperature achieved by that probe

  along with the time-of-day/date the temperature was 

  achieved will appear on the display (indicated by

  MAX and TIME appearing on the display).

Note:

 If no button is pressed for fifteen (15) seconds, 

the unit automatically returns to the current temperature 

display mode.

5.  To exit from the memory display mode, press and

  release the EVENT DATE TIME button until MIN or

  MAX no longer appears on the display, or simply do 

  not press any button for fifteen (15) seconds.

CLEARING THE MINIMUM/MAXIMUM MEMORY

1.  Slide the PROBE switch to the desired position (1 or

  2) to display the desired temperature sensor readings.

2.  Slide the DISPLAY switch to the MIN MAX position.

  The display will show the current temperature and

  minimum/maximum memory for the selected probe.

3.  Press the CLEAR MIN MAX button to clear the

  minimum and maximum memories for the probe

  being displayed.

ALARMS

Both temperature sensor (P1/P2) alarm limits may be set 

in 0.1° increments.  Probe 1 and Probe 2 alarm limits are 

set independent of each other.
With the alarm switch set to the ON position:

-The unit will sound an alarm and flash the corresponding 

LED (P1/P2) when the temperature measured is outside 

the alarm limits that have been set (equal to or lower than 

the low alarm set point, or equal to or greater than the 

high alarm set point).
-The alarm will sound regardless of which sensor is being 

displayed and regardless of the display mode.  Example:  

If Probe 1 is being displayed and the DISPLAY switch is 

set to MIN MAX, but Probe 2 reaches an alarm condition, 

the alarm will sound and the P2 LED will flash.

SETTING THE TEMPERATURE ALARM LIMITS

1.  Slide the PROBE switch to the desired position (1 or

  2) to display the desired temperature sensor readings.

2.  Slide the DISPLAY switch to the ALARM position.

  The display will show the current temperature and 

  low/high alarm set points for the selected probe.

3.  While in the alarm display mode, pressing the SELECT

  button will allow the alarm limits to be set.  
Pressing the SELECT button will cause the digits to 

flash in the following order:  Low Alarm 1st Digits→Low 

Alarm 2nd Digit→Low Alarm Decimal Digit→ High Alarm 

1st Digits→High Alarm 2nd Digit→High Alarm Decimal 

Digit→No digits flashing (value set).  
4.  Once the desired item is flashing, pressing the

  ADVANCE button will increment the value.  

5.  With the desired alarm set points appearing on the

  display, press the SELECT button until no digits 

  are flashing on the display.  The alarm settings will 

  be saved.

Note:

 While in the setting mode, if no button is pressed 

for fifteen (15) seconds, the unit automatically exits from 

the setting mode.

VIEWING THE TEMPERATURE ALARM LIMITS

1.  Slide the PROBE switch to the desired position (1 or

  2) to display the desired temperature sensor readings.

2.  Slide the DISPLAY switch to the ALARM position.

  The display will show the current temperature and 

  low/high alarm set points for the selected probe.

SPECIFICATIONS

Range: 

-58.00 to 158.00 °F

 

-50.00 to 70.00 °C

Accuracy: 

±0.05 °C when within ±2 °C of the

 

tested standard point(s); ±1°C

 otherwise.**

Resolution: 0.01°

Update Rate:  1 second (FAST)

 

10 seconds (NORMAL)

Battery: 

2 each AAA (1.5V)

Probe Supplied:  One (1) stainless steel, triple purpose 

 

probe for use in the P1 socket.

Tested Points:

Model 4241--

  Test point of 0.00°C.

Model 4242-- 

Test point of 25.00°C.  

Model 4243--

  Test point of 37.00°C.

Model 4244--

  Test points of 0.00°C, 25.00°C and 37.00°C.

**Thermometer is tested/certified with the supplied probe 

plugged in to the P1 socket.  The specified accuracy is 

valid only when using the supplied probe in the P1 socket.

SETTING THE TIME-OF-DAY/DATE

Slide the DISPLAY switch to the DATE TIME position, the 

display will show the time-of-day and date.
While in the time-of-day/date display, pressing 

the SELECT button will allow the date and time 

to be set.  Pressing the SELECT button will 

cause the digits to flash in the following order 

Year→Month→Day→Hours→Minutes →12/24 hour 

time→No digits flashing (value set).  Once the desired 

item is flashing, pressing the ADVANCE button will 

increment the value.  
With the desired time-of-day/date appearing on the 

display, press the SELECT button until no digits are 

flashing on the display.  The time-of-day/date will be 

saved.

Note:

 While in the setting mode, if no button is pressed 

for fifteen (15) seconds, the unit automatically exits from 

the setting mode.

VIEWING THE TIME-OF-DAY/DATE

To view the time-of-day/date, slide the DISPLAY switch to 

the DATE TIME position. 

DISPLAYING °F OR °C

To display the temperature readings in Fahrenheit or 

ENABLE/DISABLE ALARMS

To enable the alarm to activate when a temperature 

measured is outside the alarm limits, slide the ALARM 

switch to the ON position.
When the alarm is enabled, both Probe 1 and Probe 2 

alarm set points will be monitored.  If either sensor reaches 

an alarm condition, the alarm will activate.  It is not possible 

to enable the alarm for one sensor and disable the alarm 

for the other sensor.
To disable the alarm so that no alarm sounds when a 

temperature measured is outside the alarm limits, slide 

the ALARM switch to the OFF position.

ALARM SOUNDING

With the alarm enabled, the unit will sound an alarm and 

the corresponding (P1/P2) red LED will flash when a 

temperature being measured is outside the alarm limits 

that have been set (equal to or lower than the low alarm 

set point, or equal to or greater than the high alarm set 

point).  Until it has been acknowledged/silenced (see 

the “Acknowledge/Silence An Alarm” section), the alarm 

will sound and corresponding (P1/P2) red LED will flash 

continuously for the first sixty (60) seconds.  After 60 

seconds, the alarm will sound and LED will flash for ten 

(10) seconds every minute.
If the alarm is sounding based on the low alarm limit and 

the probe temperature is being displayed, “LO ALM” will 

also flash on the display.  If the alarm is sounding based 

on the high alarm limit and the probe temperature is 

being displayed, “HI ALM” will flash on the display.
The alarm will sound and corresponding LED will flash 

regardless of which sensor is being displayed and 

regardless of the display mode.  Example:  If Probe 1 is 

being displayed and the DISPLAY switch is set to MIN 

MAX, but Probe 2 reaches an alarm condition, the alarm 

will sound and the P2 LED will flash.
The unit will continue to alarm and flash the corresponding 

(P1/P2) red LED until the alarm has been acknowledged/

silenced by either pressing the SILENCE ALM button or 

by sliding the ALARM switch to the OFF position (see the 

“Acknowledge/Silence An Alarm” section).  The unit will 

continue to alarm and flash the corresponding (P1/P2) red 

LED even if the temperature being measured returns to an 

in-range/non-alarm condition.

ACKNOWLEDGE/SILENCE AN ALARM

While alarming, the alarm may be acknowledged/silenced 

in one of the following ways:

1.  Slide the ALARM switch to the OFF position. 

  Setting the ALARM switch to the OFF position will

  silence the alarm, but when it is switched back to the

  ON position, if the temperature being measured is

  still in an alarm condition, the alarm will sound.

  Setting the ALARM switch to the OFF position

  prevents any/all alarms from sounding.

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