... 4ACV: 5Hz-300kHz; 5.ACI: 5Hz-10kHz Digital multimeter TH1961 is a high speed,high accuracy , 1,199,999 counts meter that meets the ... measurement needs of voltage,current and resistor. Its outstanding performances, such as high ... , with ALARM at HI/LO (selectable)Communication interface RS232C, SCPI High Accuracy Digital Multimeter TH1961