This is a common problem but I'll share with you a trick my H.S. chemistry teacher taught us (40+ years ago). Take a small piece of black construction paper and hold it behind the cylinder at the the fluid level. View the fluid from underneath and you will see that the bottom of the meniscus, which is the actual level, goes dark against the light markings on the glass making the level readily visible. I've always liked glass for this reason, though I've never used the Poly... type so I'm sure the technique will work there too.
Originally Posted by Matthew Cherry