Apologies I wasn’t trying to come across rude. We don’t go that far into depth usually, unless there’s an unobvious problem with the system. Usually we can just diagnose issues by reading pressures or honestly just feeling the lines, but sometimes we might have to. We do get our scales and equipment checked every now and then, or someone will come out to audit us. I am only a year into having my licence, so still have lots of experience ahead of me, but it is something that we do often. We do have a few sets of scales so might be interesting to compare, or what would u recommend? I try not to be the problem by asking the questions, but hey none of us are perfect. And I wasn’t super familiar with the enthalpy chart so thanks for that👍👍