Measures of political ideologies are foundational to a broad range of scholarship in social sciences. Ensuring an accurate measurement of an individual’s political proclivities is of utmost importance to the credibility of published results within Political Psychology. However, as political psychological phenomena are mostly latent – in that the constructs of interest are not directly observable – its measurement requires appropriate psychometric development and validation. The lack thereof may affect the verity of reported findings as well as its replicability. With the recent surge in interest in politico-psychological research, instruments intending to gauge one’s location on the ideological space abound in the marketplace. But while producing multiple instruments for the same construct may be convenient, it is unlikely that they are all equally valid indicators of ideological content. Also, the vast majority of appraised studies utilized on the fly measures, small N, and student or convenient samples. Importantly, it is a standard practice to assume ideological inventories can be used interchangeably. This untested assumption, if shown not to hold, may pose a threat to the comparability and generalizability of findings. Despite these drawbacks, there is not as of yet a study assessing the comparability, replicability and validity of ideological instruments, and this study aims to fill this gap.