There are clear marks on the outside of the bottle for measurements. (mymilkybaby.com)
They decided to buy some land and have a fence around the property with clear markings «do not enter» and warnings that there are «traps» in the area. (law.stackexchange.com)
This is also washable and is dishwasher friendly and it might look covered outside but it has clear marks so you can easily see the measurement. (babieslounge.com)