... HzZeroing (RFL) mode to eliminate residual reading2W and 4W resistance measurement modes selectableBuilt-in mathematics calculation functions: mX+b, ... parametersDC voltage, AC voltage, DC current, AC current,2-wire resistance, 4-wire resistance, frequency, period, continuity, diodeMathematic functionmX+b, %, dB, ... & humidity:18°C-28°C,≤90%RH;When resistance range is 10M and 100M, ≤70%RHWarm-up ...