pH value of HF, hydrogen fluoride or hydrofluoric acid?
I was able to get some rough pH indicators that are allowed in our lab (cleanroom environment). No clue why a supplier like Honeywell has completely wrong data.

Apparently some sources are completely off, doing the calculation based -log(1/H+) gives the correct values in the end, tested for 50, 10, 5, 1 and 0.5%.
for a quick calculation see:
http://www.endmemo.com/chem/phcal.php