Model M1E self-propelled continuous slurry seal and micro surfacing paver comes equipped with the EMCAD (Electronic Mix Control and Diagnostic) system, which controls production and sends feedback to the operator. The system is said to tie material ratios of aggregate, asphalt emulsion, water, additive and fines together with an electronic signal and automatically maintains the ratios with feedback loops. It also diagnoses control system or engine problems and displays an error code.