R(d)-45D1 electric surface hardness tester has stable performance firm structure,safe,convinient operation. SpecificationsR(D)-45D1 surface electric Rockwell Hardness ... operation,safe, time stability, eliminate human errors, and value high precision, suitable for hardness test of cemented carbide, carburizing steels ... 29-82)HR30T,(20-77)HR45N,(10-72)HR45T R(D)-45(D)1 surface hardness rockwell tester