Re the Prime Infralite / Relax portable sauna:

Last night I had the thermometer in there with me, hanging from the inside
of the zip, just right to give me a hot shock whenever I moved and forgot
it.

As far as I could tell, the air coming out of the heaters was 70 degrees
Celsius.
The temperature inside the cubicle was 65 degrees celsius. According to the
thermometer, that was "scalding" temperature - but that, of course, would be
if it was water.
I started with five to ten minutes of standing to get the rear end cooked a
bit, then brought the chair in and sat.
It is not too bad sitting with the legs up out of the air flow.
But I did notice later when I had a bath that the skin was reddened and
patchy below the waist.

R
I am reporting this for the benefit of anyone studying the various models
available.
I am not saying mine is the one to get. I wish I'd had a variety to look at
and try.
I didn't know about Jim's when I bought it.
This one suits the Australian electrical grid, at least.