No worries about lack of sunlight at cloudbase - the Sol range functions for over 15 mins in total darkness. They are particularly user-friendly. It is solar powered - so forget batteries. Velcro the Solario to your helmet, and you have the ideal back-up vario. But it is so responsive that it feels as if you have a vario inside your brain, so it should appeal strongly to those who reject high-tec wizardry.
All models are clad in a sleek case with the solar panel at the top.
Each model is upgradable to any other model spec, the cost being the price difference between the two models at the time of change. Sol 7G incorporates a barograph as well as a final approach calculator, glide ratio to next waypoint, wind evaluation and speed to fly.