... .Product Name:21000 Count Bench Multimeter(80)21,000/51,000- count display Large VFD dual display with high brightness True RMS ... Math function %, dBm, REL RangeAuto, Manual DisplayVFD, dual display Reading mode Single display:all measurement parametersDual displa: V AC+V DC, I ... to set accuracy ComparatorTo judge HI, IN, LO and display, with ALARM at HI/LO(selectable) Communication interface RS232C, ...