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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.

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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 3. Has the sensor of the thermometer deteriorated?
(In the case of HAKKO-manufactured contact-type measuring instruments)

If the sensor is deteriorated due to corrosion by solder, the temperature may be shown lower in some cases.
A sensor can last approx. 50 times in general; however, if lead-free solder is used, the sensor must be replaced more frequently.

*NOTE If a measuring instrument manufactured by another company is used, refer to its instruction manual.
Deteriorated sensor

Sensors for HAKKO FG-101, HAKKO FG-100, HAKKO 192 and HAKKO 191

Replace it with a new one before measuring the temperature.
If the temperature is still shown lower, confirm the details in Checks 1, 2, 4 and 5.