The Conar Model 312 Resistance/Capacitance Bridge is a vintage piece of test equipment designed to measure the values of resistors and capacitors. By comparing the unknown component with precision components of known value in a Wheatstone bridge circuit, the Model 312 can be used to measure the value of resistors from 10 ohms to 10 megohms and capacitors from 10 picofarads to 1 microfarad.
 
Conar Instruments was a division of the National Radio Institute providing test equipment kits to students and graduates.