Heres the most useful bit of kit I have bought this winter. Its an inclinometer that fits to a ski pole. Most avalanches occur on slopes of 30-45 degrees and as humans we are pretty poor at estimating slope angle. This allows you to be accurate in measuring it. It also has a thermometer so you can keep an eye on the temperature during the day. I have used smart phone apps to do the same thing but having it handy on a pole is way better. Its called a Pieps 30 plus and I bought mine on Amazon having never seen one in any shops.