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In this paper, we present results from the spectropolarimetric follow-up ofphotometrically selected candidate magnetic B stars from the MOBSTER project.Out of four observed targets, one (HD 38170) is found to host a detectablesurface magnetic field, with a maximum longitudinal field measurement of105$\pm$14 G. This star is chemically peculiar and classified as an $\alpha^2$CVn variable. Its detection validates the use of TESS to perform a photometricselection of magnetic candidates. Furthermore, upper limits on the strength ofa putative dipolar magnetic field are derived for the remaining three stars,and we report the discovery of a previously unknown spectroscopic binarysystem, HD 25709. Finally, we use our non-detections as case studies to furtherinform the criteria to be used for the selection of a larger sample of stars tobe followed up using high-resolution spectropolarimetry.

MOBSTER -- IV. Detection of a new magnetic B-type star from follow-up spectropolarimetric observations of photometrically selected candidates