well here's the dumb question of the night. I just bought a new brew pot a 10 gallon brew rite polar ware. now it does not have a sight glass and no markings for gauging capacity. My question is this short of buying and installing a sight glass or marking the pot with a permanent marker (outside) is there any other product that I could use to gauge capacity I want to do 6.5 gallon boils and need to have accuracy as not to mess up my effeciancy in the end. Thanks for any input.