Good Bbs What's A Good Way To Test Viscosity In Oil Samples? (other Than Using Bbs Or Bubbles)?

What's a good way to test viscosity in oil samples? (other than using bbs or bubbles)? - good bbs

I am an engineering project for the sampling and analysis of the viscosity of the oil. I was wondering if anyone knew of any other method other than good drop ball or blowing through it? Thank you in advance: o)