this is a New Multimeter since 16th Sep 202. RM777 is an automatic range digital multimeter with 9999 words with a true effective value. The instrument is full-key operation with triple display.Measure AC voltage and DC voltageMeasure AC and DC currentMeasuring resistance/temperatureTest continuity and diodeMeasuring capacitance/NCVMeasuring frequency and duty cycleAnti-interference...

RM406B is a Fast measuring Speed Multimeter, the newest Multimeter in 2019. you can test the speed when measuring Capacitance and Resistance. very fast speed.