supply of steel setting ring: nominal dia:steel setting ring: nominal dia:,steel setting ring: nominal dia: 250.000 mm, tolerance between the nominal dia and actual diameter:+-0.007mm, roundness/cylindricity-0.0014mm. calibration certificate from nabl accredited labo ratory with proper traceability to be provided along with the material. [ warranty period: 30 months after the date of delivery ] ] , digital 3-point internal micrometer range: 225-250mm, least count:0.001mm, maximum pe rmissible error: +- 6 micron, display: lcd, character height: 7.4mm, measuring face: titanium-coated hard ened steel taper tungsten carbide, power supply: 1 battery sr 44, battery life: approx 1.2 year, certificate of inspection by oem, error alarm, function lock,2-point preset, data output, dust water protection level:ip 65, scale type: electromagnetic induction type rotary encoder. additional accessories: extension rod:150m m. calibration certificate from nabl accredited laboratory with proper traceability to be provided along wit h the material. [ warranty period: 30 months after the date of delivery ] ]