MS7221 Volt/mA Calibrator is a source and measurement tool. This Calibrator can be used in measurement output 0 to 24 mA DC current loop,and 0 to 10V DC voltage. 

DCV Measure: 0~100mV, 0~10V±0.02%
DCV Source:   0~100mV, 0~10V±0.02%
DCmA Measure(% of span):   0~24 mA ±0.015%
DCmA Source(% of span):   0~24 mA ±0.015%
Display: 88888 counts.
Measure loop current signals with very high accuracy of 0.015% and 1uA resolution
Measure voltage output process signals from PLCs, transmitters
Source or simulate 24 mA loop current
Source voltage to 100 mV or 10V  
24V loop supply with simultaneous current measurement  
Weight: 350g (include battery)
Size: 190mmx89mmx42mm
Battery: 9V DC,006P or 1604