This article aims to seek understanding about these corruption measurement tools by mapping and analyzing some of these tools in terms of purpose, scope, principles and usage. The underlying assumption of these tools as well as their strengths and weaknesses are also analyzed. The most critical issue on "can corruption be measured?" is discussed. Some concrete cases from different countries are explored to show the limitation of the existing measurement tools. In order to be more effective about anti-corruption, this article proposes qualitative approach to supplement the existing measurement tools. In addition, instead of focusing on the success or failure of anti-corruption effort at the macro level only, the effectiveness of programs and projects at the micro level should be taken into account as well.