The GVT-427B is compact analog AC millivoltmeters ideal for low level voltage measurements beyond ordinary multimeter capabilities; 300uV sensitivity is maintained over 100V full scale. GVT-427 provides dual channel measurement, simultaneously or separately. Voltage scale is separated into 12 ranges, instantly accessible by a large rotary selector. The wide measurement range(10Hz~1MHz) and voltage(-70dB~+40dB) provide ample headroom for most applications.