Multi-function calibration reference with case, for resistance (100, 1K, 10K, 100K Ohm), DCV (5V 0,007%), DCA (1mA, 0,1%), ACV (5V square wave, 0,1%), ACA (1mA, 0,2%), frequency (100Hz), duty cycle (100Hz, 5V square wave), capacitance and inductance, revision 8