Use the strip cup to detect mastitis. Squirt first stream of milk from each teat into strip cup. Inspect for flakes, lumps, and other signs of abnormal milk. Aluminum cup holds 1-1/2 pints and has a handle and convenient hang-up hook, Choice of fine-mesh stainless steel screen or black anodized tray insert. Screen seems to splash less and is handy for straining small amounts of milk. Some vets recommend black tray; they say problems are more visible.