supply of set of items for rockwell hardnessset of items for rockwell hardness,set of items for rockwell hardness tester. set consists of 4 items. standard blocks with nabl calibration certificate. 1) standard test block (steel) in the range of hrb 80 to 95- 1no./set, 2) standard tes t block (steel) in the range of hrc 25 to 30- 1no./set, 3) standard test block (steel) in the range of hrc 55 to 60- 1no./set. 4) brinell microscope for measuring the dia of impression. - 01 no /set. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]