... supply AC220V ,DC5V,DC12V,DC24V measure DC voltagevoltage meter with RS232, RS485 can be display the data in the screen ... same time, it can connect the USBThe meters utilities Largescale Integrated circuit (LSI) , the design of the circuit is very precise ... years of export experience and 12 years experience cooperation with Panasonic voltage meter with RS232, RS485 can be display the data in the ...