... for many oversea groups High cost performanc Jyins square panel meter in frequncy meter,volt meter ,current meter,watte meter and multifunction meterUses and ... on the standard of GB/T7676-1998, and the digital meter is on the standard of GB/T22264-2008. Its ... the level index ±100%.The installation,Unless specified, the meter is usually installed in a vertical position. Other installation positions ...