继电平计算机 relay computer

信号电平计 signal-level meter ; meter, signal-level

晶体管式电平计 transistorized level meter

电平计水位表 level meter

平衡电位计 balancing potentiometer

平方电位计 quadratic potentiometer ; quadratic performance index

自动平衡式电位计 self-balancing potentiometer

光电平衡电位计 [电子] photoelectrically balanced potentiometer