R
Ryan LPS
I've used a cheap digi gauge for yonks, as said it saves messing around with water & topping up a U gauge - which is a right PITA!! Never had it calibrated, never tested it & I use it for everything. I've never taken the side of a house out & my boilers are always A1 on the FGA, after using it to commission them.
Dickie wat gauge you got pal