㈠Features:
     ZX21A rotary type resistance box is a more value resistor which is made up of by six decimal        switches in series,Resistance element connect on every contact of the switch,to get                resistance value through  changing the switch brush position,according to the resistance            value,respectively from the two binding posto the terminal.
     ZX21 DC resistor accords with  《Laboratory on DC resistor》ofJB/T8225-1999 industrial              standard.

㈡Applications:

     ZX21 DC resistor can be used for adjusting the resistance value in the DC circuit, which has low ohm value and is widely used in laboratory, school and used as measurement of electricity 

and other experiments for factory and R&D institution. And can also used in the DC circuit

which is not request precision. 

㈢Power Rating:
      0.2W，0.3W
㈣Tolerance:
      B(±0.1%)，D(±0.5%)，F(±1.0%)，G (±2%)，J (±5%)