This meter is used in hospital ICU/CCU patient beds. Those beds have a type of bubble mattress. Sometimes the air in the bubble mattress decreases, and this bubble meter pump is used to inflate it.
I originally bought this for my father. My father passed away one day after I purchased this bubble meter pump. It was used for only 10-15 minutes. The meter is in brand new condition. No need to worry. I am currently in a difficult situation, so I want to sell it. Please contact me.