I've got one of these https://www.amazon.co.uk/gp/product/B000YIYDZ6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Nothing special, but the probe would mean you could monitor, say, in-tent and out-tent temperatures (or in and out of the sleeping bag). You need to manually switch between the in...