Which pH paper and pH meter that are used for detect the pH of oil?

p$H$ refers to the relative concentration of ${H}^{+}$ and $O {H}^{-}$ in aqueous (water-based) solution, and does not really apply to oils.
As pointed out, p$H$ does not really apply to non-aqueous solutions. Oils can entrain water, which (or so am I told) can support concentrations of hydrogen sulfide, which can act as a weak acid in water. Other than this you are going to have to find a better informed specialist.