I tried to roughly place the bead probe in the same location as yours, after multiple attempts I settled on slightly closer to the ramp as that was the only position that didn't interfere with the flow.

The wife has relegated all roasting activities to the tool shed which is a bit nippy, but the exhaust keeps my hands warm

Here's a thermal image of the IKAWA after five runs. Used a linearly-declining RoR profile with a finish inlet temperature of 270C (which equates to about a 225C BT in the chamber).



All that blue can be deceiving - I wouldn't recommend running the IKAWA in the playroom of a daycare center. But still, kudos to IKAWA for minimizing direct exposure to the hazardous temperatures within. Not giving out any litigable advice here, but it looks like the IKAWA crosses the burn threshold about halfway up - YMMV.

Also deceiving are some of the objects in the image: the control button is black, and the polished copper tubing I use to redirect the exhaust output has a blue, ghostlike image. It's because polished metal has very low emissivity, which flummoxes the IR camera. Everything else: the white powdercoat paint, glass, and cork all have relatively high IR emissivity for more accurate readings.

I was interested in attaching 3D printed parts to the surface of the IKAWA, so it was useful to know what areas of the roaster will play well with the plastic parts. Some 3D printing materials (like PLA) can start to soften in the mid 40's. So, bad news for PLA prints: the upper shell of the IKAWA can reach 50-60C. Good news is other materials, like PETG, ABS, ASA, Nylon, should be OK.