Carmel has really done a nice job designing this and other apps. So simple yet contains lots of good functionality to truly make it useful in the field and office.
I'm always a little skeptical of these engineering apps because you never know how well they really work on these little iPhone screens, but sometimes simple is better.
So far, the results appear to be quite accurate and even the fitting equivalent lengths for the different pipe materials look correct.
I use this app a couple times a week so it's more than paid for itself.
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