Super high quality "Haicco" FG-100 - Which direction does temperature sensor go?

[sofakng]

Hey guys ... I'm excited that I bought a really high quality "Haicco" FG-100 soldering temperature sensor, but lucky for me it also came with very high quality temperature sensors:



Only the blue side of the sensor is marked, so which side goes to the red on the FG-100?

[ledtester]

The part no. of the official Hakko part is "191-212":

https://hakkousa.com/191-212-replacement-sensor-for-fg-100b-100-101-tip-themometer.html

Based on the orientation of the center clamp I would hazard to guess that the left loop is the red terminal - but that's just my best guess.

You can find the knockoffs on ebay -- just search for "Hakko 191-212".