Late to reply - yes it measures temp of the air inside the tire.
Bought these for eBike but might work well for the CB300 as well as padding seems a bit better than the much more expensive MotoSkivvies tho not as wide. The skivvies have lasted tho getting thin in some areas and the elastic is tired so depends on the riding pants to stay in place - the padding looks good as new tho.
I'll be happy if these give some relief from sore ass.. tell you soon enough for both vehicles.
I have the same (or very similar) pair of these diaper shorts as well.
Work well on long rides.
Hopefully I don't end up in a pair of diapers out of necessity when I get old. Not a great feeling.