... measurement principle based on the internationally popular metal material hardness tester. It has high accuracy, small size, easy to ... pressure vessels, turbine units and other equipment. Leeb hardness tester is widely used in petrochemical, aerospace, electric power, gas ... of ±8HL ( HLD=800 5 point arithmetic average ) Operating Temperature:0~40℃ Storage temperature:-20~50℃ Operating voltage:4.7V~6 ...