HSRD-45 automatic Rockwell hardness tester

HSRD-45 automatic Rockwell hardness tester 70-94HR15N，42-86HR30N，20-77HR45N 67-93HR15T，29-82HR30T，10-72HR45T Initial test force: 3kgf (29.42N) Total test force: 15kgf (147.1N), 30kgf (294.2N), 45kgf (441.3N)