  The SIDDHARTINO experiment at the DA{\Phi}NE Collider of INFN-LNF, the pilot
run for the SIDDHARTA-2 experiment which aims to perform the measurement of
kaonic deuterium transitions to the fundamental level, has successfully been
concluded. The paper reports the main results of this run, including the
optimization of various components of the apparatus, among which the degrader
needed to maximize the fraction of kaons stopped inside the target, through
measurements of kaonic helium transitions to the 2p level. The obtained shift
and width values are {\epsilon}_2p = E_exp-E_e.m = 0.2 {\pm} 2.5(stat) {\pm}
2(syst) eV and {\Gamma}_2p = 8 {\pm} 10 eV (stat), respectively. This new
measurement of the shift, in particular, represents the most precise one for a
gaseous target and is expected to contribute to a better understanding of the
kaon-nuclei interaction at low energy.
