supply of supply and installation of o-ring sizing gauge, slide style, national type, telescoping, suitable for accurate measurement of o-ring inner diameter (id), outer diameter (od) and cross-section thickness. note: gauge shall be compatible with national / as-568 standard o-ring sizes or equivalent.supply and installation of o-ring sizing gauge, slide style, national type, telescoping, suitable for accurate measurement of o-ring inner diameter (id), outer diameter (od) and cross-section thickness. note: gauge shall be compatible with national / as-568 standard o-ring sizes or equivalent.,supply and installation of o-ring sizing gauge, slide style, national type, telescoping, suitable for accurate measur ement of o-ring inner diameter (id), outer diameter (od) and cross-section thickness. note: gauge shall be compatible with nation al / as-568 standard o-ring sizes or equivalent. make: delson rubber or equivalent. [ warranty period: 12 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]