For water balancing, in the day, the electronic stuff was just starting to turn up, but I kept going with the mercury manometer, it was the best.
We had a couple of perspex ones for the lower pressure systems, and a glass ones for the higher pressure systems.
No worries at all, unless one opened the wrong valve, and the mercury disappeared
A lot of this modern crap gives me the pips, probably nothing wrong with it, its just me being old school.
Easy to lose stuff,from the memory, if not doing it regularly, today I had to replace one of those Tacm controllers,couldnt remember how to set it used to know that off the top of my head, even the newer model with the 24hr time clock.
Sat there today scratching my head reading the instructions like a monkey

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