Correctly measuring the temperature of a soldering iron tip is not as easy a task as it seems at first glance.
Measurement with an ordinary pyrometer will give nothing - the measurement field is much larger than the geometric dimensions of the soldering iron tip and the pyrometer will "capture" surrounding objects, while the readings of the device will be averaged over the measurement field in some way.
A drop thermocouple from a multimeter or thermometer will not provide good thermal contact.
If you use a more massive thermocouple, then the temperature of the tip will be distorted by heat leakage for heating the thermocouple.
Often, the results of such measurements are only misleading, forcing the soldering station to be recalibrated unnecessarily, replacing the heater in the plunger, etc.
A thermometer for a soldering iron is distinguished, first of all, by a special design of the sensor, which ensures good thermal contact and low inertia.
The measurement time is 2-3 seconds.
The sensor is suspended on three strings attached to spring loaded tensioners. Strings are also conductors.
The sensor's resource is limited - about 50 measurements (10 pcs of sensors are supplied with the device).
Only the results of measuring the temperature of the soldering iron tip with a specialized thermometer can be considered as an argument for setting up or repairing soldering equipment.
Completeness:
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thermometer - 1 piece
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thermal sensors - 10 pcs.
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battery KRONA - 1 piece