... (now the first display indicator lighting)the first row ,the second row ,the third row LED display separately represent UA,UB,UC or ... (now the second display indicator lighting )the first row ,the second row ,the third row LED display separately represent IA,IB,IC.it's ... (now the second display indicator lighting)the first row ,the second row ,the third row LED display separately represent P,Q,COS,it' ...