is there a possibillity to see temperature reading without entering activity? I was looking at glances and I do not see this. FR255.
There's a Connect IQ widget (glance) for this, but it doesn't support 255 yet. You could click Contact Developer on the app's page and ask the dev if they can update it to add 255 support:
And here's one a widget will show the internal temperature, it's history, and the temperature of a paired and connected Tempe..