The GARDCO EZ Zhan cup meets and exceeds ASTM D4212. GARDCO EZ viscosity cups are calibrated, with a manufacturer's Drain Time Warranty of +/-3% based on standard oils of certified viscosity.
Item:
GARDCO S90 Signature Zahn Cup
An improved version of the Zahn Signature Viscosity cups, calibration of the S90 cups match the earlier Zahn Signature cups.
