* Made from borosilicate glass * For measuring kinematic viscosities of transparent, Newtonian liquids according to ASTM D 445 and ISO 3104.Specifications confirm to ASTM D 446 and ISO 3105. * Comes with calibration certificate @40 & 100 Deg. C * We will permanently mention size & Sl. No. on viscometer tube & Others details mention at calibration certificate. * We will provide separate certificate for each tube.