The main technical parameters of the Leeb hardness tester: indication error: relative error ± 0.8% (HLD = 800) indication value repeatability relative error 0.8% (HLD = 800 hours) Operating temperature: 0 ~ 40 ° C Operating voltage: 4.7V ~ 6.0V Weight: 0.675Kg (Standard configuration: Hardness tester host + printer + D type impact device) Main function: Automatic identification of impact device types (D, DC, D+15, C, G, E) can be tested by keyboard input Date and test code; the test material and test direction can be selected through the keyboard; the mutual conversion between six hardnesses (HL, HRC, HRB, HB, HV, HS) and the mutual conversion between hardness and tensile strength (δb) can be realized. The results of each test can be displayed repeatedly, and the error can be deleted; the test status and test value of the field can be displayed on the full screen; the field working state of the instrument can be output at any time; the battery voltage is automatically detected, and when the working voltage is lower than the rated value, the alarm is automatically The printer can be separated from the host.