Tektronix dmm4020 digital multimeter vfd 5 digit display tektronix dmm4020 p the tektronix dmm4020 is a dual display digital multimeter that has been designed for bench field service and system applications p p with 5 frac12 digit resolution the dmm4020 multimeter enables you to measure volts ohms and amps with a basic v dc accuracy of 0 015 the dc leakage current measurements and frequency measurements provide you with even more capability in the same instrument the dedicated