2017JIS C 1263-2:2017 Electromechanical var-hour meters -- Part 2: Measuring instruments used in transaction or certification for connection through transformer
2014JIS C 1263-2 AMD 1:2014 Var-hour meters -- Part 2: Measuring instruments used in transaction or certification (Amendment 1)
2009JIS C 1263-1:2009 Var-hour meters -- Part 1: General measuring instrument