The ROE Calculator APP is available for download nowChina - ROE Visual has announced the release of its ROE Calculator APP. This application is a complete upgrade of the previous ballast calculator and has added many new options to create essential technical calculations for LED screens. Key features include ballast calculation, pixel calculation, power requirement analysis, user-friendly interface and comprehensive data library The ROE Calculator APP is connected to the ROE Visual website - you only require one login for the website and the APP.