... Pressure, Viscosity, Conductivity,Fluid state. Accuracy of Flow: ±0.2% (0.5% ) ±zero stability/current flow x 100% ... Explosion-proofCurrent output: 4~20mA,standing for media densityVoltage output: ±0.5VDC,standing for media density.Frequency output: 1 ~ ... 10000Hz,standing for flow,Electrical level,0~15VDC,load of 2K,frequency output ...