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Not had this probelm before, as I usually rate boilers when fitting and serviceing at the meter rather than using my manometer, today I wanted to check a Glowworm ****tflow in a bungalow, so ok got boiler running full with hot tap on bath, display on meter blank, tried pressing buttons, kept having to wait for the reading, tried timeing for 2 mins, then pressing butons to get a second reading, had to wait, by the time it had fannied around the another 10 seconds had passed, so not very accurate, how is it done on these type of meters, am I missing someting obvious it was a Landis /Gyr Libra, I think ?
Ended up using the u gauge.
Ended up using the u gauge.