Channel A,B,R 3-ch Channel Select A,B,R,A-R,B-R Dynamic Range 66dB(+16--50dBm) with Detector Dynamic Range 60dB(+10--50dBm) with SWR Autotester R 46dB(+16--40dBm) 75ohms Detector max +13dBm Offset control A,B >+-65dB res0.1dB 3-digits LED Zero dB reference set Reference Position Locator Offset Zero Position Level resolution 10dB,5,2,1,0.5,0.2dB/div Memory 1024point ,Average ,Subtract ,Recall Display Mode Real time ,Refresh ,Refresh Hold ,X-Y plot(real time) ,X-Y plot (refresh) Smooth Filter ,Marker CRT 8*10div 1.22cm/div Recorder-out Pen-up GP-IB 100-240V 85VA 11Kg 133*429*500mm