  We present three features which can be used to distinguish the R^2-inflation
Higgs-inflation from with ongoing, upcoming and planned experiments, assuming
no new physics (apart form sterile neutrinos) up to inflationary scale. (i)
Slightly different tilt of the scalar perturbation spectrum n_s and ratio r of
scalar-to-tensor perturbation amplitudes. (ii) Gravity waves produced within
R^2-model by collapsing, merging and evaporating scalaron clumps formed in the
post-inflationary Universe. (iii) Different ranges of the possible Standard
Model Higgs boson masses, where the electroweak vacuum remains stable while the
Universe evolves after inflation. Specifically, in the R^2-model Higgs boson
can be as light as 116 GeV. These effects mainly rely on the lower reheating
temperature in the R^2-inflation.
