In the shameless self-promotion category, I wanted to share some data.
Our PRO meters are individually calibrated. We are the only company that does this. That means that we take the time to measure each PRO meter we sell using 10 displays and 12 modes of operation (the UHP and LED projector modes each has a screen and lens mode). This means that not only is the meter calibrated against some general, average error rate. It is specifically calibrated to remove any unit-to-unit variation that might crop up.
I had recently begun to wonder if the Display 3's design was such that individual calibration were really necessary. I had to work on an enterprise order today in which I had to measure 9 meters back-to-back in order apply the PRO corrections. This afforded a unique opportunity to test this hypothesis. Here's the data for the white point for one of our measurement modes:
As you can see, a factory calibration would not have been very helpful. Between units, the x axis deviated by as much as 0.009 and the y axis deviated by as much as 0.007. Even an average of these would have left up to x0.006 and y0.004 uncorrected, which is well into the visibility range. The CIELUV dE between meter 2 and meter 6 is 11.2. This is not a subtle difference.
On a related note, I have now had the opportunity to re-calibrate several Display 3s, and I have found that if the user takes reasonable care in storage and use that these meters are remarkably stable over time--unlike past designs. What this means is that my general recommendation of annual re-calibration can, I think, be safely extended to every other year.Edited by TomHuffman - 11/10/12 at 2:42pm