... ,High impedance,Auto,wide range,high reliability, Digital MillivoltmeterDF1945 4 1/2 Millivoltmeters,Intelligent,High speed,High accuracy,High impedance,Auto,wide ... %±20100uV1000MΩ20V±0.8%±20±1.2%±20±2%±201mV10MΩ,30pF200V±0.8%±20±1.2%±20±2%±2010mV10MΩ,30pF800V±0. 5%±2040Hz~400Hz100mV10M ...