supply of 3-point internal micrometer with interchangeable radiuses anvils of tool-steel for optimum centering, new constant force digital readout with l.c. 0.01/0.001mm, metric/inch switchable, inbuilt ip67 electronics, rs 232 output, inbuilt bluetooth data transmission, operational range: 300-350 mm3-point internal micrometer with interchangeable radiuses anvils of tool-steel for optimum centering, new constant force digital readout with l.c. 0.01/0.001mm, metric/inch switchable, inbuilt ip67 electronics, rs 232 output, inbuilt bluetooth data transmission, operational range: 300-350 mm,3-point internal micrometer with interchangeable radiuses anvils of tool-steel for optimum ce ntering, new constant force digital readout with l.c. 0.01/0.001mm, metric/inch switchable, inbuilt ip67 electronics, rs 232 output, inbuilt bluetooth data transmission, operational range: 300-350 mm, with ca libration & warranty certificate, should include: digital display unit, measuring head with exchange able anvils of range 300-325mm, & 325-350mm with ? 325 mm master setting ring with nabl. model -xt 500 series of baker, make :- baker , bower , naren or similar [ warranty period: 30 months after the d ate of delivery ] ]