Love my Tilt. Hard to convey the value of checking the progress of the fermentation at a glance, both in terms of SG and temperature, with my iPad, which I just leave plugged in nearby. I would make the case that, even if the bubbles did impact the readings to some minor degree during the active portion of the fermentation, it would not undo the main value of tracking the active portion of the fermentation. Stickman is correct about the interference of the cap, which can and does noticeably affect the Tilt readings during red wine fermentation. He has a fine idea of enclosing the Tilt. On the other hand, in a 6.5 gal batch, I usually keep the entire crushed portion in a large nylon mesh bag, which accomplishes the same goal - allowing the Tilt to float freely outside the bag in the juice. This may seem eccentric, but I have also experimented successfully with holding the bag (and thus the cap) down below the surface by using using several (nylon mesh bagged) bundles of 2" stir bars inside the skins bag along with a few Neodymium magnets (2" x 1" x 1/2") outside my PETG fermentation vessel (to anchor the big bag inside down). You still have to do the punch downs (pushing your tool into the top of the bag) to release trapped CO2 gas, but at least the Tilt can float freely. Cautionary note: one should be very careful with rare magnets since they can cause finger injuries if caught between two magnets. I encased my Neodymium magnets (on all but one side) inside cut pieces of foam swim Noodles to help prevent unintended direct contact with another rare earth magnet.