well my mrs has been getting loads of stuff for the baby we are expecting and yesterday she came home with a baby monitor where it has a built in digital thermometer .
so without her know i stuck it in back of the van last night and kept the hand held bit by my bed which shows the temp . so i could make sure my tm was nice and toasty .
why did i not think of getting one of these earlier lol. on cold night i worry about the heaters going wrong or a power cut so set the alarm to go off on the monitor if it drops below 3 degrees. if you get a power cut the monitor has a battery life that kicks in and lasts for 12 hours