DFDAU
In my airline we use Digital Flight Data Acuisition Units to record amongst other things fuel flows, engine health reports and any number of additonal (to the FDR) parameters that Engineering would like to see tracked.
The Flight Summary Report (auto printed on engine shutdown) includes Vetical G reports.
MAX VG for the entire flight
MIN VG for the entire flight
MAX VG LAND - the G on touchdown. If that figure is greater than 1.8G we have to call Maintrol and a heavy landing inspection will be carried out within 9 sectors.
However, whilst one cannot assume that we pilots are able to judge the subtleties of G on landing we DO generally know when "we've crunched her in" or "stroked her on". What is interesting is that the VG figures often quoted for a typical 'greaser' often is much higher than one would expect (1.2 -1.4G) and on the days where you have carried out the positive landing that Mr B loves so much you end up with a figure often lower (1.1 -1.3G).
I've never been told where these accelerometers are fitted and whether they are converted due to angular mountings but the data that the little green box give us is not treated as Gospel. If in doubt we would call the company to pull the Quick Access Recorder (different to the DFDAU) data to determine the actual touchdown ROD etc..