there are no extension offices that test gauges near me.
A lot of factories I've been to use small calibration businesses or even just a guy who calibrates stuff as a side hustle. If there is any manufacturing in your area it might be worth asking folks who work there if they know of someone who does that kind of work but doesn't really advertise.
Condolences, that really sucks.
There wasn't sad food to go along with it but, my wife and I had a very similar experience. My nephew passed away after 3 months of trying to repair a heart defect (HLHS specifically). My SIL, her husband and, her other kids had been living with for the past six months because we lived near the hospital he was treated at. Their extended family spent a lot of nights with us as well.
The day after he passed away, they all went home. My wife and I are child free so we were just alone in this quiet, empty house that had been loud and crowded since we found out our nephew was going to be born with a bad heart. The weight of the past months hit us all at once and we sat there sobbing for what felt like hours. It's been like three years and I still get teary thinking about it.