I have a refractometer for brew day and I calibrate the Tilt against room temp water before adding it to the fermenter and, so, at that point I have - my recipe in a spreadsheet with predicted OG (based on my systems and fairly accurate volumes used), the refractometer reading (take 3 or so, if there is something seemingly off), a spare hydrometer which, if used, must be adjusted for temperature difference of wort as measured (or allowed to rise to room temp from chilled temp at racking). At the back end, I have predicted FG from the recipe spreadsheet, a refractometer with the adjustment calculator, the same hydrometer as used on the front end, the Tilt to know it hasn't moved over 3-4 days, and a lab grade finished hydrometer that is highly accurate.
But in reality, if I am pressure fermenting, I just use the Tilt to monitor stasis at the end (since the pressure throws off the Tilt reading accuracy - I think) and most recently, I usually don't even take a final gravity reading.
YMMV, of course, and some times it is great to know precisely where you are on a particular beer...for me, my beers are usually low ABV, so high accuracy isn't terribly necessary. It is a rarity for me to make a beer above 1.050, FWIW.