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GAOTek Thermocouple Thermometer with Four Inputs (Data Logger)


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GAOTek Thermocouple Thermometer with Four Inputs (Data Logger) supports K, J, E and T types thermocouple probes and holds 16,000 records each channel DataLogger. It provides large backlit LCD screens helps the users to read the data in any environment. The fast sampling rate allows the thermometer to capture the temperature change in a short period of time. It offers the four inputs channel T1, T2, T3 and T4. The tilt stand design makes the unit easy to stand on the desk for reading on the site.

Key Features

  • T1-T2 function
  • Four input channels; 4 readings display
  • Temperature alarm function
  • Data Hold function
  • Adjustable auto power off timer
  • Quick response with high accuracy
  • Support K, J, E, T type thermocouple probe
  • Min/Max/Avg function
  • Micro USB PC interface
  • Data logging up to 16,000 records in each channel
  • Large backlit LCD
  • Recall function to instantly read-out up to 100 sets manually saved data

Technical Specifications

Measurement Range -328 °F ~ 2498 °F (-200 °C ~ 1370 °C)
Accuracy ± 0.1 % rdg + 1.4 °F , ± 0.1% rdg + 0.7 °C
Resolution 0.1 °F, 0.1 °C
Input Protection 30 Vrms (maximum)
Battery Type 1.5 V AAA size battery (4 pieces)
Dimension 7.36 in x 2.95 in x 1.14 in (187 mm x 75 mm x 29 mm)
Weight 10.93 oz. (310 g)
Operating Humidity < 80 %
Storage Humidity < 70 %
Operating Temperature 32 °F ~ 122 °F (0 °C ~ 50 °C)
Storage Temperature 14 °F ~ 140 °F (-10 °C ~ 60 °C)

Additional Information:

Standard Accessories:

  • Temperature Probe – 2 pieces.
  • Micro USB cable
  • Software
  • Battery
  • User Manual


  Battery condition indicator
MIN Minimum indicator
MAX Maximum indicator
AVG Average indicator
SET Setup option indicator
  Auto Power Off enabled indicator
REC Recording data logger indicator
FULL Memory full indicator
MEM 88 Memory group indicator
RECALL88 Recall Memory group reading indicator
TYPE KJET Thermocouple type
8888 Temperature reading
T1T2T3T4 Temperature channel
T1-T2 Temperature subtraction mode
ALARM Temperature alarm indicator
Hi High Temperature alarm indicator
Lo Low Temperature alarm indicator
OFFSET Compensate for probe errors
°C °F Temperature measurement units
HOLD Data hold indication

①Thermocouple Input

②Display Screen

③Power ON/OFF Button

④Back Light Button



⑦°C, °F Button

 ⑧REC Button

⑨RECALL Saved Reading Button

 ⑩SETUP Button

⑪MEM Button (Set 100 Memory)

⑫USB Interface

⑬Tilt Stand

 ⑭Battery Compartment

Button Instructions:
Power ON/OFF Button:
Press the button to turn on the meter. Press and hold  button for 3 seconds to turn off.
Backlight Button:
Press to turn on the LCD backlight. This makes it easier to read in dark environment. Press again to turn off backlight. The backlight will be automatically turned off after 30 seconds to save battery power.
Data-Hold Button:
Press “HOLD” button to freeze the data shown on the LCD screen. Press it again to exit Data-Hold mode.
Note: When the unit is in the Data-Hold mode, ”MIN/MAX/AVG”, “°C°F”,”RECALL” , and “SETUP” buttons are disabled.
REC Button:
Press “REC” button to start recording data. The “REC” symbol will display on the screen. To stop recording, press “REC” button again.
Note: During recording period, most of the buttons are disabled, such as the “°C°F”, “SETUP”. All settings must be made before starting the data logger function.
Note: When the memory is full (16000 recorders), “FULL” symbol will blink on the LCD screen. The data logger stops.
Note: When battery power is low ( symbol lights up on the screen), data logger cannot be started. If the battery is running low during data logging, it will stop recording automatically.
MEM Button:
Press “MEM” button to save readings on the LCD screen. The “MEM 88” symbol lights up on the screen for 2 seconds. Press the “MEM” button again to store next group readings. The store readings on the LCD screen for 00~99 group.
RECALL Save Reading Button:
Press the “RECALL” button to recall saved readings. The “RECALL88” symbol lights up on the screen. Press the “HOLD”, “REC”,MIN/MAX/AVG”, or “°C°F” button to select MEM group. The LCD shows “hour: minute: second” on the screen for 2 seconds, and then shows the readings.Press “RECALL” or button to exit RECALL mode
 Under this mode, the unit simultaneously monitors and stores the maximum, minimum and average value in the memory. The unit will keep updating/refreshing the data.
To start:

  1. Press “MIN/MAX/AVG” “MAX” symbol lights up on LCD, the reading shows the maximum data.
  2. Press “MIN/MAX/AVG” button again to show minimum data; the “MIN” symbol lights up on LCD.
  3. Press “MIN/MAX/AVG” button again to show average data; the “AVG” symbol lights up on LCD.
  4. Press “MIN/MAX/AVG” button again, the “MAX, MIN and AVG” symbol blinks together, the readings shows real time data.

To exit MAX/MIN/AVG mode:
Press and hold “MIN/MAX/AVG” button for 2 seconds to exit MAX/MIN/AVG mode.
Selecting Temperature Units:
Press the “°C°F” button to switch between Celsius (°C) and Fahrenheit (°F).
SETUP Button:
Press the “SETUP” button to enter setup options. Press “SETUP” again to exit setup mode anytime

Setup Options:

  1. Press the “SETUP” button to enter setup options. Press it again to exit anytime.
  2. Using the “HOLD”, “REC”,MIN/MAX/AVG”, or “°C°F” button to adjust parameters or move setting items.
  3. Press the “MEM” button to save changes and move to next setting option.

Menu Item:

  1. Set thermocouple type.
  2. Set interval time for data logging.
  3. Set offset to compensate for probe errors.
  4. Set alarm point.
  5. Set T1-T2 subtraction mode.
  6. Set auto power off time.
  7. Set system clock.

Menu Description:
Select thermocouple type: K, J, E, or T
Press the “MIN/MAX/AVG”, or “°C°F” button to select thermocouple type.
Setting interval time for data storing:

  1. Press the “MIN/MAX/AVG”, or “°C°F” button to set minute or second.
  2. Press the “HOLD”/ “REC” button to increase/decrease value.

Set interval time range: 1
Second (00:01) to 60 minutes 59 seconds (60:59)

Set offset to compensate for probe errors:
The user can adjust the readings of thermometer to compensate for the errors against a specific thermocouple.

  1. Press the “MIN/MAX/AVG”, or “°C°F” button to select thermocouple channel.Setting thermocouple channel blinks on the LCD screen.
  2. Press the / button to increase / decrease value.

Note: The offset to compensate for probe errors range: ±5 °C or ±9 °F.

Set alarm point (only for channel T1):
Set the window

  1. Press the “HOLD” or “REC” button to turn on or off.
  2. When setting on mode, press the “MEM” button to set Hi and Lo limit.

Set T1-T2 subtraction mode:
Press the “HOLD” or “REC” button to turn on or off T1-T2 subtraction mode.

Note: When setting T1-T2 subtraction mode on, T1-T2 will display at the bottom of LCD.

Set auto power off time:
Press the “HOLD” or “REC” button to select auto power off option 10, 30 minutes, 1, 2, 4, 8 hours, or off.

Set system clock:
The unit is built-in a clock so that the data logger function can also record the data and time along with the measurement value.

  1. Press the “MIN/MAX/AVG”, or “°C°F” or button to select year, date, or time.
  2. Press the “HOLD”/ “REC” button to increase / decrease value.

Note: Check the clock setting after replacing batteries. If necessary, reset system clock.

Clearing Data Logger Records:

  1. Turn off the unit.
  2. Press and hold “REC” button and then press power button to turn on the unit.
  3. Keep holding “REC” and button, then LCD will show “MEM”, “CLr” and “SUrE 5, 4…1, 0” until clean the memory. (To abort, release all buttons in process)

Connecting to a computer:
The meter can be connected to PC through a micro USB cable to download recorded data or perform real time monitoring or data logging in the software interface.

Battery Replacement:

  1. When the battery voltage drops below proper operation range, the symbol will blink on the LCD display and the battery needs to be replaced.
  2. Before replacing the battery, power off the meter, and disconnect all temperature probes. Open the cover of the battery cabinet by a screwdriver. Replace the old batteries with four new UM-4 or AAA size batteries.
  3. Close the battery cabinets cover and fasten the screw.

Test link Software:

The package contains:

  1. Software CD disk
  2. Micro USB cable

System Required:

Minimum Hardware Required:

Windows XP/ VISTA/ Windows 7/ Windows 8/ Windows

  1. PC or laptop with CD-ROM drive.
  2. At least 50 MB hard disk space available to install this package.
  3. Recommended screen resolution 1024X768 or above.

 Tutorial – Quick Start to use:

Recording real time data in waveform:

  1. Power on the 4 Channel Thermometer first and connect it to a PC USB port with the cable
  2. Start the program.
  3. If the connection is successful the panel will display the same value as the 4 Channel Thermometer. If fail to connect the meter with PC, it will display “No Connection” on the panel window
  4. Select sampling rate from Real-Time Graph window
  5. When the connection is successful, click “Real Time | run” or from main menu to start recording real time data and there will be a waveform on the Real Time Graph Window.
  6. Click “Real Time | Stop” or to stop recording.

How to save the recorded real time data to a file?

  1. Click the graph window you want to save and the graph window will become active, then choose File | Save from main menu or click from the tool bar.
  2. There will be a save dialog window for you to choose the file name and file type to save.
  3. There are three types of file format you can choose, binary file (*.ghf), text file (*.txt) and EXCEL format file (*.csv). The *.ghf file use much fewer disk space to save the data than the other two file formats, but it can only be used in this package. Text file can be opened by this package and any other word processor program like word, notepad etc. EXCEL format file can be opened by this package and Microsoft EXCEL.
    Note: If decimal separator is comma in your country, this file format will be disabled, because .CSV file also use comma to be data separator.

How to load the recorded data from the memory of 4 Channel Thermometer and save it to a file?

  1. Power on the 4 Channel Thermometer.
  2. Press the “REC” button of the meter to start recording data.
  3. After a while, press “REC” button again to stop recording data.
  4. Connect the Meter to PC
  5. Start the program.
  6. Choose Data Logger from main menu or click from tool bar.
  7. In reference to Data Logger, see DataLogger

Main menu:

File | Open– Retrieve files from the disk.
Save – Save the active window (when the caption bar is highlighted) data to the disk.
Print – Print the data of the active window (graph or list).
Printer Setup – Select printer.
Real Time Data | Run – Start collecting real time data.
Stop – Stop collecting real time data
By opening the DataLogger Window, the user can load recorded data of meter to PC in this window.
Output To Graph – Graphing tabular data.

File | Exit: Terminates program.
View | Control Panel: By opening the Panel Window, the user can control meter via the button in this window.
View | Real-Time Graph: Open Real-Time Graph display to graph the present data.


When you have the thermometer connected to PC, select “DataLogger” from main menu or click Datalogger icon from tool bar to load recorded data from the meter and there will be a progress indicator to show the loading status. If error occurs, just click “DataLogger icon” again.After the data was downloaded, the left hand side will show how many data sets were loaded and detail information for each data set (start data, start time, recording rate and record numbers).

For Example:

It will transfer first data set to graph on the right hand side. The user can also click at any other data set to choose that set for graph.



– Display or hide Statistic1.
– Display or hide Statistic2.
– Normal cursor.
– When selected, the mouse cursor will become a cross sign when moving to the graph, click on the graph to mark a cross sign on the graph. This is available only when “Split” option is unchecked. And all the mark you make will exist with T1.
– When selected, the mouse cursor will become an “I” sign when moving to the graph, click on the graph to annotate. This is available only when “Split” option is unchecked. And all the text you make will exist with T1.
-Separate the four channel.
-Combine the four channel.
– Graph Customization
– Change the Y axis extension.Note: When the Split is unchecked, graph will use T1 as the Y axis display range.

– To Undo the Zoom

You can zoom this graph by using mouse:
To Zoom

  1. Press the left mouse button and drag the cursor to select the new extents.
  2. Release the mouse button.

You can choose channel number showing in the graph.

  1. Click “Graph Option” to call Customization dialog.
  2. Select Subsets tab.
  3. Select a single channel or multiselect (hold Ctrl key, use mouse to choose) channels.

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