ASTM D5481 High‑Temperature High‑Shear (HTHS) Lubricant Apparent Viscosity Tester SH417 High‑Temperature High‑Shear Tester The SH417 High‑Temperature High‑Shear Tester is designed and manufactured to meet the technical requirements of ASTM D5481. It adopts the multi‑capillary viscometer method to determine the apparent viscosity of lubricating oils. This instrument is used to measure the apparent viscosity (HTHS value) of lubricants under high‑temperature and high‑shear
