Standards: ASTM D1883 BS 1377:4 AASHTO 193-99 ISIRI 1159     Model BPSO 640 BPSO 638 BPSO 639 Description Motorized CBR test Machine digital indicator CBR test Machine Automatic CBR test Machine Power supply 0.37kW,220V,50Hz 0.37kW,220V,50Hz 0.37kW,220V,50Hz Indicator proving ring LCD 1*6″ large LCD 4*6″ Capacity 45kN 45kN 45kN Accuracy 20kN 20kN 20kN Flow meter dial