The Group Glass is an adjustable viewing mirror for monitoring espresso shot extractions with a bottomless portafilter.
We all like to use naked portafilters to check the extraction of our shots. What no one likes is having to crouch down below the counter top in order to catch a glimpse of the bottom of the basket. Save the squats for the gym. The Group Glass is a free standing and quick to adjust mirror that sits right on top of your drip tray. With an oleophobic coating, the inevitable coffee splatter is easier to clean up than non-coated glass.
Using a strong neodymium magnet, the mirror is held securely to a polished ball bearing mounted to the base. The user is able to quickly adjust and re-adjust the mirror when the viewing angle is changed.