Standards: ASTM D1883, D1559 BS 1377:4 AASHTO 193-99, T245 ISIRI 1159, 12381       Model BPSO 635 BPSO 634 BPSO 636 Description CBR-Marshall Compression Machine with Proving Ring Digital CBR-Marshall Compression Machine Automatic CBR-Marshall Compression Machine Power Supply 750kW,220V,50Hz 750kW,220V,50Hz 750kW,220V,50Hz Indicator Proving ring LCD1*6” Large LCD4*6” Capacity 45kN 45kN 45kN Accuracy 25N 25N