... represent UA,UB,UC or UAB,UBC,UCA.it's unit is V .indicator K or M lignting means KV&MV ... row LED display separately represent IA,IB,IC.it's unit is A.indicator K or M lighting means KA&MA ... row ,the third row LED display separately represent P,Q,COS,it's unit is W,Var.indicator K or M lighting means ...