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Why is the measured tip temperature lower than the set temperature?
Important points are maintenance of the soldering iron and measuring instrument and using the correct measurement method.

Top page for "Why is the measured tip temperature lower than the set temperature?"
Check 1 Are the tip, element cover, nut, etc. oxidized?
Check 2 Is the tip shape changed?
Check 3 Has the sensor of the thermometer deteriorated? (In the case of HAKKO-manufactured contact-type measuring instruments)
Check 4 Are the batteries low on power?
Check 5 Is the correct measurement method suitable for the measuring instrument being performed?

Check 2. Is the tip shape changed?

Since the length and weight vary depending on the tip type, if the tip shape is changed, the thermal capacity will be changed, causing the temperature to become lower or higher in some cases.
In the case of changing soldering tip shape, it is necessary to perform fine adjustment (calibration adjustment or change of offset value).
When using the 900M-T-B tip with the set temperature of 350ºC, if the tip is changed to the 900M-T-I or 900M-T-K tip

If changing to the 900M-T-I, the displayed temperature is approx. 10ºC lower.
If changing to the 900M-T-K, the displayed temperature is approx. 30ºC higher.

Therefore, to maintain the same temperature, it is necessary to perform fine adjustment (calibration adjustment or change of offset value) without fail.


Perform temperature fine adjustment (calibration adjustment or change of offset value) before remeasurement.
If the temperature is still shown lower, confirm the details in Checks 1 and 3 through 5.
[Calibration adjustment]

Insert a tool such as a screwdriver and adjust the CAL volume.Turning anticlockwise decreases the temperature and turning clockwise increases the temperature.

[Position of CAL volume]

* Since the CAL position varies depending on each product, refer to their instruction manual.


Soldering Station HAKKO 928 Soldering Station

HAKKO 931 Soldering Iron

HAKKO 933·934

Soldering Station

HAKKO 936 Soldering Station

HAKKO 937



[Changing the offset value]

Change the offset value while referring to each instruction manual.

Soldering Station

HAKKO FX-951 Soldering Station

HAKKO FX-952 Soldering Station (Future Module)

HAKKO FM-202 Soldering Station

HAKKO 938