Alignment of the Measurement Scale Mark during Immersion Hydrometer Calibration Using an Image Processing System. - Luis Manuel Peña-Perez; Jesús Carlos Pedraza-Ortega; Juan Manuel Ramos-Arreguín; Saúl Tovar-Arriaga; Marco Antonio Aceves-Fernández; Luis Omar Becerra; Efrén Gorrostieta Hurtado; José Emilio Vargas Soto (Sensors, 2013)