Hakko FG 101 Thermometer Soldering Accessories

Click on above image to view full picture

More Views

  • Hakko FG 101 Thermometer Soldering Accessories

Hakko FG 101 Thermometer Soldering Accessories

Hakko Soldering & Desodering Equipments

Hakko FG 101 is a soldering iron tester that comes handy for the daily maintenance of station type soldering irons. It comes with amazing features that measure Leak Voltage Check, Tip-to-ground resistance, and Tip temperature. These features are very importance to prevent the devices being worked on from any sort of damage and are also important for proper maintenance of station type irons. In addition to these features, the MAX HOLD button allows you to see the maximum temperature reached during a soldering process and also has an AUTO ZERO function to correct the zero point error.



One tester for all your soldering iron maintenance needs.
What should you check when doing a daily inspection of your soldering iron?
Grounded soldering irons are maintained by inspecting leak voltage, tip-to ground resistance, and tip temperature.
Grounded soldering irons cannot be maintained by checking insulation resistance. This method was used in the past in order to find out the level of leak current.

 What is 'Leak voltage'?
Leak current is the current that leaks from the tip to a board or device. Leak voltage is a specific measurement of the level of this current. The leakage can adversely affect delicate devices, so it is necessary to check leak voltage on a daily basis.
Leak voltage is the current that leaks from the tip of a soldering iron to a board or device

 What is 'Tip-to-ground resistance'?
Most leak current flows from the tip via the ground wire to the outlet ground terminal, and is prevented from affecting the device. Because of this, tip-to-ground resistance is another important issue that must be checked daily.
It is also important to check tip-to-ground resistance on a daily basis.

 Why is tip temperature important?
As the tip, element cover and other parts oxidize, heat conduction deteriorates and the tip temperature becomes lower. This causes the difficulty of soldering. Therefore, tip temperature should be inspected daily to have better soldering.
Maximun current value mesured with HAKKO FG-101

100V-120V Spec 5A
220V-240V Spec 3A
Note: HAKKO FG-101 is broken when beyond maximum current value is measured. 

In addition to traditional features, the FG-101 comes with two new functions: MAX HOLD and AUTO ZERO.

MAX HOLD Function Constantly displays the maximum temperature
AUTOZERO Function Automatically corrects zero point error of measuring instruments
Traditional Features Lead-free sensor
Measures leak voltage by True Root Mean Square (TRMS)
Highly reliable - Resistant to drift and changes in temperature
* The FG-101 does not come with the Monitor Output function that was included in past models.

 MAX HOLD Function
Display Sample of MAX HOLD FunctionWhen the MAX HOLD function is on, the maximum temperature is constantly displayed on the LCD.
If the MAX HOLD button is pressed for a short time (less than 1 second) the maximum temperature is updated. If the button is pressed for a long time (1 second or longer) the MAX HOLD function turns off.
 AUTO ZERO Function
The zero point error of measuring instruments can be corrected by simply pressing the AUTO ZERO button and waiting for the display to return to normal.

Display Sample of AUTO ZERO Function


Model No.


Power consumption

2.6W (100V), 2.9W (110V), 2.6W (120V), 2.7W (220V), 2.8W (230V), 3.0W (240V)

Temperature resolution


Temperature measurement range

0 to 700ºC

Temperature precision

±3ºC (300 to 600ºC)
±5ºC (other than above)

Temperature sensor

K (CA)type thermocouple

Voltage resolution


Voltage measurement range

0 to 40mV (AC)

Voltage precision

± (5% of reading + 1 digit)

Resistance resolution


Resistance measurement range

0 to 40Ω

Resistance precision

± (5% of reading + 1 digit)


LCD : 3 1/2digits
Burnout : -1
MAX HOLD : 'MAX HOLD' is displayed at the lower right of the LCD.

Operating environment

Ambient temperature/humidity range : 0 to 40ºC, 20 to 90%RH (without condensation)

Environmental conditions

Applicable rated pollution degree 2 (According to IEC/UL 61010-1)





* Weight (w/cord)
* Temperature sensor (No.191-212 or No.191-212C) can only be used ti measure temperatures below 500ºC. To measure higher temperatures, use an applicable temperature probe.
* When a sensor is not attached or it burns out,the alarm symbol of Burnout(-1) is displayed. The same symbol is also displayed when a temperature outside the measurement range is detected.