It was difficult deciding where to put this -- so feel free to move this post if you'd like!! I am working on calibrating some Omega pressure transducers, and I just want some verification on my overall error. Model -- PX303 various pressures. Zero Balance -- with 0 PSI (gage pressure) on the instrument, my voltage output can vary by this percentage. This is an adjustment to make in my software -- i.e. if it is saying .6 Volts is zero, I am OK because the 0.1V difference is still within the instruments zero balance range. Span Tolerance -- if I put the upper limit of pressure on the instrument, this is the voltage variation allowed on the upper end i.e I might not get 5.5V output on the max PSI on the deadweight tester. I need verification if that's indeed what these ranges are, and if so -- Can I not include them in my error calculation? By making the software adjustments, the only error left should be the accuracy error?? Thanks!