... certification 4ACV: 5Hz-300kHz; 5.ACI: 5Hz-10kHz Digital multimeter TH1961 is a high speed,high accuracy , 1,199,999 counts meter ... in TH1961, such as high speed low noise 26 bits A/D converter which gives the good linear and low noise ... ALARM at HI/LO (selectable)Communication interface RS232C, SCPI bench Digital Multimeter TH1961