Zahn 2 Viscosity Cup. If you want the perfect HVLP finish you need to thin your products properly and testing with a viscosity meter is a must. This is the test cup I prefer.
ACCURATELY MEASURE MATERIAL THICKNESS FOR THE PERFECT FINISH
A genuine Apollo viscosity cup will help you accurately measure your material thickness for perfect thinning/reducing every time. Calibrated to the equivalent of a Zahn 2.