Single scale 0÷2.5 bar for steam pressure. 1/8" M BSP threads. The threads on this part will only fit the Professional model, and it is not compatible with the Europiccola. The Europiccola have a male threaded cap on the top of the upper sight glass fitting where the gauge could be located. The threads on this cap fitting measure 10.9 mm OD. The Professional model have an adapter fitting on the top pf the upper sight glass fitting that the gauge threads into. The threads on this adapter fitting measure 12 mm OD. So, this means the the female threads on the upper sight glass fitting are different for each model, and that's why you can't put a gauge onto the Europiccola.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.