Fish Autotuber is another smart belay device which allows you to feed out rope very easy at the same time it pinches any rope in between 8 mm to 11 mm. It weighs only 68 grams. It is very intuitive and it also has a lever like Grigri for making lowering down more easy and safe. You can also just put in your thumb and lift the device up to release its friction on the rope. Video
All in all, it is a very user friendly belay device and the price is around 60 Euro with the Rondo crew carabiner included. The Rondo is mandatory to use and we asked why?
"During the development process we found out that it is extremely important that the carabiner's cross section fits to the belay device's shape. Only in this combination we can guarantee that the correct function is given. That´s the reason why we decided to sell the FISH in combination with our RONDO carabiner only. If a different carabiner is used, it could happen that the carabiner blocks and doesn´t provide any friction to the rope."